Red Hat Linux Security Advisories & Vulnerabilities
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Latest Red Hat advisories
Medium [CVE-2025-10911] use-after-free with key data stored cross-rvt
A use-after-free vulnerability was found in libxslt while parsing xsl nodes that may lead to the dereference of expired pointers and application crash. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat Discovery 2; Red Hat Hardened Images; Red Hat OpenShift AI 3.4; Red Hat Update Infrastructure 5; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat OpenShift Container Platform 4. Affected products named by the advisory: Red Hat package: libxslt.
High [CVE-2025-9900] Libtiff: libtiff write-what-where
A flaw was found in Libtiff. This vulnerability is a "write-what-where" condition, triggered when the library processes a specially crafted TIFF image file. By providing an abnormally large image height value in the file's metadata, an attacker can trick the library into writing attacker-controlled color data to an arbitrary memory location. This memory corruption can be exploited to cause a denial of service (application crash) or to achieve arbitrary code execution with the permissions of the user. This attack requires user interaction to run the malicious TIFF image file, hence the CVE is maintained as important. Red Hat severity: Important — CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-123. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 17 more.
High [CVE-2025-4953] Podman: build context bind mount
A flaw was found in Podman. In a Containerfile or Podman, data written to RUN --mount=type=bind mounts during the podman build is not discarded. This issue can lead to files created within the container appearing in the temporary build context directory on the host, leaving the created files accessible. This issue is classified as Moderate rather than Important because exploitation requires several preconditions: an attacker must have unprivileged access to the host during the build process, the container build must include long-running steps (e.g., RUN sleep) that prolong the existence of the temporary build context, and files must be created with overly permissive permissions (e.g., 4777). The vulnerability does not allow remote code execution or compromise of running containers, and it only exposes files temporarily present in the build context. Therefore, while it can lead to information disclosure, the scope and impact are limited to local users with concurrent access, making the overall risk moderate. Red Hat severity: Moderate — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-378. Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4.12; Red Hat OpenShift Container Platform 4.13; Red Hat OpenShift Container Platform 4.14; and 4 more.
Low [CVE-2025-8277] Libssh: memory exhaustion via repeated key exchange in libssh
A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability. The Red Hat Product Security team has assessed the severity of this vulnerability as Low.The issue requires an authenticated client to repeatedly initiate key exchanges with incorrect guesses, which leads to memory not being properly released. While this flaw can result in gradual memory exhaustion and potential denial of service (DoS) on the client side, it is not easily exploitable in typical usage scenarios and does not affect servers. The vulnerability does not compromise confidentiality or integrity and poses limited impact on system availability under normal operating conditions. Weakness: CWE-401. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:18683. Affected products named by the advisory: Red Hat package: libssh2.
High [CVE-2025-9566] Podman: podman kube play command may overwrite host files
There's a vulnerability in podman where an attacker may use the kube play command to overwrite host files when the kube file container a Secrete or a ConfigMap volume mount and such volume contains a symbolic link to a host file path. In a successful attack, the attacker can only control the target file to be overwritten but not the content to be written into the file. Binary-Affected: podman Upstream-version-introduced: v4.0.0 Upstream-version-fixed: v5.6.1 The Red Hat Product Security team has evaluated this vulnerability as having the Important severity. This happens because of the consequences of an successful attack and the low complexity (AC:L) on exploiting this vulnerability. Although the attacker cannot control the content written to the target file, depending on which file was targeted, the exploitation of this flaw may lead sensitive data corruption (I:H) and leading the system to crash resulting in a Denial of Service attack (A:H). Weakness: CWE-22. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Telecommunications Update Service; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions; and 17 more.
Medium [CVE-2025-9901] Libsoup: improper handling of http vary header in libsoup caching
A flaw was found in libsoup’s caching mechanism, SoupCache, where the HTTP Vary header is ignored when evaluating cached responses. This header ensures that responses vary appropriately based on request headers such as language or authentication. Without this check, cached content can be incorrectly reused across different requests, potentially exposing sensitive user information. While the issue is unlikely to affect everyday desktop use, it could result in confidentiality breaches in proxy or multi-user environments. The Red Hat Product Security team has rated this vulnerability as a Moderate severity, since exploitation requires uncommon deployment conditions such as an application enabling SoupCache in a proxy-like configuration. In the worst case scenario, cached responses containing confidential data may be served to unintended users, leading to significant information disclosure. Standard GNOME desktop applications are not affected under normal use. Weakness: CWE-524. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: libsoup3.
High [CVE-2025-9784] undertow madeyoureset http/2 ddos vulnerability
A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the "MadeYouReset" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS). This vulnerability is rated with an Important severity. It is simple to exploit because it does not require authentication and could result in a Denial of Service (DoS). While some DoS flaws are classified as Moderate, “MadeYouReset” is Important because of the limited barriers (no specialized tooling or advanced scripting) to exploitation, which directly impacts service availability. Since these resets consume CPU and memory resources and can be generated at scale over a single TCP/TLS connection, a remote attacker could exhaust server capacity quickly, impacting all legitimate clients. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
High [CVE-2025-8067] Udisks: out-of-bounds read in udisks daemon
A flaw was found in the Udisks daemon, where it allows unprivileged users to create loop devices using the D-BUS system. This is achieved via the loop device handler, which handles requests sent through the D-BUS interface. As two of the parameters of this handle, it receives the file descriptor list and index specifying the file where the loop device should be backed. The function itself validates the index value to ensure it isn't bigger than the maximum value allowed. However, it fails to validate the lower bound, allowing the index parameter to be a negative value. Under these circumstances, an attacker can cause the UDisks daemon to crash or perform a local privilege escalation by gaining access to files owned by privileged users. This vulnerability has been rated with an Important severity by the Red Hat Product Security team. This is due to the low complexity to exploit it and the possible local privilege execution risk associated to a successful exploitation of this flaw. Weakness: CWE-125. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 11 more.
Medium [CVE-2025-4877] Libssh: write beyond bounds in binary to base64 conversion functions
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh. Red Hat Product Security classified this vulnerability as having a Moderate severity. This happens because of the complexity of the attack, the possible misusage of the libssh API and the fact the attacker may not have full control over the positions and contents written into the heap. No supported Red Hat products are affected by this issue since only 32-bit builds are vulnerable. Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:18683. Affected products named by the advisory: Red Hat package: libssh.
Medium [CVE-2025-4437] Cri-o: large /etc/passwd file may lead to denial of service
There's a vulnerability in the CRI-O application where when container is launched with securityContext.runAsUser specifying a non-existent user, CRI-O attempts to create the user, reading the container's entire /etc/passwd file into memory. If this file is excessively large, it can cause the a high memory consumption leading applications to be killed due to out-of-memory. As a result a denial-of-service can be achieved, possibly disrupting other pods and services running in the same host. This vulnerability was rated as Moderate by the Red Hat's Product Security team as it requires the attacker to own an account with minimal privileges to create pods using the CRI-O utility. Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2025-7195] privilege escalation due to incorrect permissions of /etc/passwd
Early versions of Operator-SDK provided an insecure method to allow operator containers to run in environments that used a random UID. Operator-SDK before 0.15.2 provided a script, user_setup, which modifies the permissions of the /etc/passwd file to 664 during build time. Developers who used Operator-SDK before 0.15.2 to scaffold their operator may still be impacted by this if the insecure user_setup script is still being used to build new container images. In affected images, the /etc/passwd file is created during build time with group-writable permissions and a group ownership of root (gid=0). An attacker who can execute commands within an affected container, even as a non-root user, may be able to leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container. Red Hat Product Security has rated this vulnerability as moderate severity for affected products which run on OpenShift. The vulnerability allows for potential privilege escalation within a container, but OpenShift's default, multi-layered security posture effectively mitigates this risk. Affected products named by the advisory: RHEL-9-CNV-4.17; RHEL-9-CNV-4.18; RHEL-9-CNV-4.20; multicluster engine for Kubernetes 2.6; and 18 more.
Medium [CVE-2025-8419] keycloak smtp inject vulnerability
A vulnerability was found in Keycloak-services. Special characters used during e-mail registration may perform SMTP Injection and unexpectedly send short unwanted e-mails. The email is limited to 64 characters (limited local part of the email), so the attack is limited to very shorts emails (subject and little data, the example is 60 chars). This flaw's only direct consequence is an unsolicited email being sent from the Keycloak server. However, this action could be a precursor for more sophisticated attacks. Affected products named by the advisory: Red Hat build of Keycloak 26.0; Red Hat build of Keycloak 26.2.
Low [CVE-2025-8556] Github.com/cloudflare/circl: circl-fourq: missing and wrong validation can lead to incorrect results
A flaw was found in CIRCL's implementation of the FourQ elliptic curve. This vulnerability allows an attacker to compromise session security via low-order point injection and incorrect point validation during Diffie-Hellman key exchange. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-1287. Affected Red Hat products: Builds for Red Hat OpenShift; Custom Metric Autoscaler operator for Red Hat Openshift; Multicluster Global Hub; OpenShift Pipelines; OpenShift Serverless; OpenShift Service Mesh 3; Red Hat Advanced Cluster Management for Kubernetes 2; Red Hat Advanced Cluster Security 4; Red Hat Ceph Storage 5; Red Hat Ceph Storage 6; Red Hat Ceph Storage 8; Red Hat Developer Hub; Red Hat Edge Manager preview; Red Hat Enterprise Linux AI (RHEL AI); Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4; Red Hat OpenShift Dev Workspaces Operator; Red Hat OpenShift for Windows Containers; Red Hat OpenShift GitOps; Red Hat OpenShift Virtualization 4; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat Trusted Application Pipeline; Red Hat Trusted Artifact Signer; Red Hat Trusted Profile Analyzer. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2025-5988] Aap-gateway: csrf origin checking is disabled
A flaw was found in the Ansible aap-gateway. Cross-site request forgery (CSRF) origin checking is not done on requests from the gateway to external components, such as the controller, hub, and eda. This issue is classified as Moderate because the exploitation conditions significantly limit its practicality and impact in typical deployments. Successful exploitation requires the attacker to first obtain a valid CSRF form token tied to the victim’s session, which is generally protected by browser same-origin policies and modern CSRF mitigations—making token theft non-trivial without an existing compromise or major misconfiguration. Additionally, the gateway is still performing Referer checks when TLS edge termination is in place, which, while not as strict as Origin validation, reduces exposure in many real-world setups. The need for a valid authenticated session and precise token alignment means the attacker cannot simply trick a user into visiting a malicious site and execute arbitrary state-changing requests; they must overcome multiple layered controls. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-352. Affected Red Hat products: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9. Red Hat fixing advisory: RHSA-2025:12772.
Low [CVE-2025-8283] Netavark: podman: netavark may resolve hostnames to unexpected hosts
A vulnerability was found in the netavark package, a network stack for containers used with Podman. Due to dns.podman search domain being removed, netavark may return external servers if a valid A/AAAA record is sent as a response. When creating a container with a given name, this name will be used as the hostname for the container itself, as the podman's search domain is not added anymore the container is using the host's resolv.conf, and the DNS resolver will try to look into the search domains contained on it. If one of the domains contain a name with the same hostname as the running container, the connection will forward to unexpected external servers. This vulnerability has been rated as having a Low security impact by the Red Hat Product Security team. For an attack to be successful, the attacker needs to have control over the domains used into the host's resolv.conf and have a prior knowledge about the hostnames and connections used by the running containers. Additionally, the attacker does not have full control over the amount or sensitivity of data sent by the container to the attacker controlled host and TLS validations may avoid the container to connect to the malicious domain. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-15.
Medium [CVE-2025-8114] Libssh: null pointer dereference in libssh kex session id calculation
A flaw was found in libssh, a library that implements the SSH protocol. When calculating the session ID during the key exchange (KEX) process, an allocation failure in cryptographic functions may lead to a NULL pointer dereference. This issue can cause the client or server to crash. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, due to its local attack vector and high complexity of exploitation. Although it requires specific allocation failure scenarios, successful exploitation can result in a crash of SSH clients or servers using libssh. Weakness: CWE-476. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7 as not affected. Red Hat fixing advisory: RHSA-2026:18683. Affected products named by the advisory: Red Hat package: libssh.
Low [CVE-2025-4878] Libssh: use of uninitialized variable in privatekey_from_file
A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption. Red Hat Product Security has rated this vulnerability as having Low severity as the affected privatekey_from_file() function is deprecated and should not be used. Weakness: CWE-416. Affected Red Hat products: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat OpenShift Container Platform 4. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2026:18683. Affected products named by the advisory: Red Hat package: libssh2.
Medium [CVE-2025-7519] Polkit: xml policy file with a large number of nested elements may lead to out-of-bounds write
A flaw was found in polkit. When processing an XML policy with 32 or more nested elements in depth, an out-of-bounds write can be triggered. This issue can lead to a crash or other unexpected behavior, and arbitrary code execution is not discarded. To exploit this flaw, a high-privilege account is needed as it's required to place the malicious policy file properly. This vulnerability was rated with a Moderate severity by the Red Hat Product Security team. This happens because the directories that hold Polkit's policy files are owned by the root user, drastically reducing the attack surface for this vulnerability. Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: polkit.
High [CVE-2025-7365] phishing attack via email verification step in first login flow
A flaw was found in Keycloak. When an authenticated attacker attempts to merge accounts with another existing account during an identity provider (IdP) login, the attacker will subsequently be prompted to "review profile" information. This vulnerability allows the attacker to modify their email address to match that of a victim's account, triggering a verification email sent to the victim's email address. The attacker's email address is not present in the verification email content, making it a potential phishing opportunity. If the victim clicks the verification link, the attacker can gain access to the victim's account. Affected products named by the advisory: Red Hat build of Keycloak 26.0; Red Hat build of Keycloak 26.2.
High [CVE-2025-7424] Libxslt: type confusion in xmlnode.psvi between stylesheet and source nodes
A flaw was found in the libxslt library. The same memory field, psvi, is used for both stylesheet and input data, which can lead to type confusion during XML transformations. This vulnerability allows an attacker to crash the application or corrupt memory. In some cases, it may lead to denial of service or unexpected behavior. This type confusion vulnerability in libxslt has been rated as Important due to its potential to corrupt memory and crash applications during XML transformations. The flaw stems from unsafe reuse of the psvi field between stylesheet and input nodes, causing the program to misinterpret internal data types. When malicious XSLT stylesheets are processed, this confusion can lead to memory corruption or denial-of-service. Given libxslt’s widespread use in web browsers, server-side applications, and XML processing pipelines, the impact of this vulnerability can extend to user-facing services and backend systems alike. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-843. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Hardened Images; Red Hat Enterprise Linux 6. Red Hat lists Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4 as not affected. Will not fix / out of support: Red Hat Enterprise Linux 6.
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