Red Hat Linux Security Advisories & CVEs
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Security advisories for your Linux release
Pick your distribution release to see every advisory issued for it and its severity mix. Fixes ship as errata — keep the system patched. This is the release's advisory history, not a per-package scan.
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Red Hat Security Data API
Red Hat Enterprise Linux errata (RHSA) via the official Red Hat Security Data API — CVE severity, CVSS and affected packages. A credential-free official source.
Latest Linux advisories
High [CVE-2026-31787] fix double free via VMA splitting
fix double free via VMA splitting. Red Hat rates this moderate (CVSS 7.3). Weakness: CWE-763. Affected package(s): kernel, kernel-rt. Resolved in Red Hat advisory RHSA-2026:27288 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
High [CVE-2026-31786] Buffer overflow in drivers/xen/sys-hypervisor.c
Buffer overflow in drivers/xen/sys-hypervisor.c. Red Hat rates this moderate (CVSS 7.1). Weakness: CWE-170. Affected package(s): kernel, kernel-rt. Resolved in Red Hat advisory RHSA-2026:27288 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1.
Medium [CVE-2026-3833] Policy bypass due to case-sensitive nameConstraints comparison
Policy bypass due to case-sensitive nameConstraints comparison. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-178. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 12 more.
Medium [CVE-2026-5142] Cross-tenant private SSH key disclosure via taxonomy scoping bypass
Cross-tenant private SSH key disclosure via taxonomy scoping bypass. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-639. Affected package(s): foreman. Resolved in Red Hat advisory RHSA-2026:34366 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8.
Medium [CVE-2026-7163] Authenticated users can gain administrative access to OpenShift clusters via credential disclosure
Authenticated users can gain administrative access to OpenShift clusters via credential disclosure. Red Hat rates this important (CVSS 6.1). Weakness: CWE-312. Affected package(s): multicluster-engine/assisted-service. Resolved in Red Hat advisory RHSA-2026:12116 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-7500] Improper Access Control on Keycloak Server when the account Account API feature is disabled
Improper Access Control on Keycloak Server when the account Account API feature is disabled. Red Hat rates this moderate (CVSS 5.4). Weakness: CWE-425. Affected package(s): rhbk/keycloak-operator-bundle:26.4.13, rhbk/keycloak-rhel9-operator:26.4, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9:26.4, rhbk/keycloak-operator-bundle:26.6.3, rhbk/keycloak-rhel9:26.6. Resolved in Red Hat advisory RHSA-2026:30049 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Low [CVE-2026-3832] Security bypass allows acceptance of revoked server certificates via crafted OCSP response
Security bypass allows acceptance of revoked server certificates via crafted OCSP response. Red Hat rates this low (CVSS 3.7). Weakness: CWE-179. Affected package(s): gnutls-main, rhui5/haproxy-rhel9:1781525671, gnutls, rhui5/installer-rhel9:1781525693, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 9.
High [CVE-2026-42198] Client-side Denial of Service via malicious SCRAM-SHA-256 authentication
Client-side Denial of Service via malicious SCRAM-SHA-256 authentication. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. Affected package(s): postgresql-jdbc, pgjdbc. Resolved in Red Hat advisory RHSA-2026:25030 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat AMQ Broker 7; and 2 more.
High [CVE-2026-38993] Arbitrary file write via directory traversal in Buckets component
Arbitrary file write via directory traversal in Buckets component. Red Hat rates this important (CVSS 8.1). Weakness: CWE-22. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-37555] integer overflow in ima_reader_init()
integer overflow in ima_reader_init(). Red Hat rates this important (CVSS 8.2). Weakness: CWE-190. Affected package(s): rhaiis/model-opt-cuda-rhel9:1782352950, rhaiis/vllm-spyre-rhel9:1782352919, libsndfile, rhaiis/vllm-rocm-rhel9:1782353093, rhaiis/vllm-cuda-rhel9:1782352847. Resolved in Red Hat advisory RHSA-2026:25197 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 7 more.
High [CVE-2026-42011] Security bypass due to incorrect name constraint handling
Security bypass due to incorrect name constraint handling. Red Hat rates this moderate (CVSS 7.4). Weakness: CWE-295. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 12 more.
High [CVE-2026-42012] Certificate validation bypass due to improper handling of URI and SRV SANs
Certificate validation bypass due to improper handling of URI and SRV SANs. Red Hat rates this moderate (CVSS 7.1). Weakness: CWE-295. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 12 more.
High [CVE-2026-42013] Certificate validation bypass due to oversized Subject Alternative Name
Certificate validation bypass due to oversized Subject Alternative Name. Red Hat rates this moderate (CVSS 8.2). Weakness: CWE-295. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 11 more.
High [CVE-2026-42009] Denial of Service via DTLS packet reordering vulnerability
Denial of Service via DTLS packet reordering vulnerability. Red Hat rates this important (CVSS 7.5). Weakness: CWE-475. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:29794 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 40 more.
High [CVE-2026-42010] Authentication Bypass via NUL Character in Username
Authentication Bypass via NUL Character in Username. Red Hat rates this important (CVSS 7.1). Weakness: CWE-170. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 38 more.
High [CVE-2026-5260] Information disclosure via heap overread in RSA key exchange
Information disclosure via heap overread in RSA key exchange. Red Hat rates this moderate (CVSS 8.2). Weakness: CWE-126. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; 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; and 10 more.
Medium [CVE-2026-4873] Information disclosure due to incorrect TLS connection reuse
Information disclosure due to incorrect TLS connection reuse. Red Hat rates this moderate (CVSS 5.3). Weakness: CWE-319. Affected package(s): curl-main. Resolved in Red Hat advisory RHSA-2026:12916 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-5773] Wrong file transfer due to incorrect SMB connection reuse
Wrong file transfer due to incorrect SMB connection reuse. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-1025. Affected package(s): curl-main. Resolved in Red Hat advisory RHSA-2026:12916 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-6253] Proxy credential disclosure via redirects to unauthenticated proxies
Proxy credential disclosure via redirects to unauthenticated proxies. Red Hat rates this moderate (CVSS 5.3). Weakness: CWE-201. Affected package(s): curl-main. Resolved in Red Hat advisory RHSA-2026:12916 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-5545] Authentication bypass due to incorrect HTTP Negotiate connection reuse
Authentication bypass due to incorrect HTTP Negotiate connection reuse. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-488. Affected package(s): curl-main. Resolved in Red Hat advisory RHSA-2026:12916 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.