Medium [CVE-2026-15588] GDBusServer pre-authentication DoS via unbounded SASL line buffering
This medium-severity Red Hat Linux advisory covers CVE-2026-15588 affecting 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.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Get an email when Red Hat Linux RHEL & SELinux publishes the next one.
See Red Hat Linux RHEL & SELinux's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).
Summary
A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a client.
An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang.
A local or remote unauthenticated attacker could send an engineered stream of data without line length limitations during the authentication process (`gdbusauth`), leading to excessive memory allocation and CPU consumption.
This resource exhaustion can result in a denial-of-service (DoS) condition, causing applications or services dependent on GLib to become unstable or crash. Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).
Weakness: CWE-770.
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 26 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- glib2-0:2.80.4-12.el10_2.21
- glib2-0:2.80.4-4.el10_0.17
- glib2-0:2.56.1-13.el7_9.1
- glib2-0:2.56.4-177.el8_10
- glib2-0:2.56.4-10.el8_4.7
- glib2-0:2.56.4-158.el8_6.7
- glib2-0:2.56.4-165.el8_8.2
- glib2-0:2.68.4-19.el9_8.9
- glib2-0:2.68.4-7.el9_2.7
- glib2-0:2.68.4-14.el9_4.8
- glib2-0:2.68.4-16.el9_6.7
- cert-manager/jetstack-cert-manager-acmesolver-rhel9:1791371080
- cert-manager/jetstack-cert-manager-rhel9:1791371069
- cert-manager/cert-manager-operator-rhel9:1791788287
- cert-manager/cert-manager-istio-csr-rhel9:1791378395
- cert-manager/cert-manager-operator-bundle:1791970484
- cert-manager/jetstack-cert-manager-acmesolver-rhel9:1791459707
- cert-manager/jetstack-cert-manager-rhel9:1791459711
- cert-manager/cert-manager-istio-csr-rhel9:1791459759
- cert-manager/cert-manager-operator-rhel9:1789029076
- cert-manager/cert-manager-operator-bundle:1791966259
- cert-manager/cert-manager-operator-rhel9:1788348522
- cert-manager/jetstack-cert-manager-acmesolver-rhel9:1788348571
- cert-manager/jetstack-cert-manager-rhel9:1788348571
- cert-manager/cert-manager-istio-csr-rhel9:1788348594
- cert-manager/jetstack-cert-manager-rhel9:1790223279
- cert-manager/cert-manager-istio-csr-rhel9:1790223719
- cert-manager/cert-manager-operator-rhel9:1790272426
- cert-manager/jetstack-cert-manager-acmesolver-rhel9:1790589998
- cert-manager/jetstack-cert-manager-rhel9:1790589912
- cert-manager/cert-manager-istio-csr-rhel9:1790589914
- cert-manager/cert-manager-operator-rhel9:1790589855
- cert-manager/cert-manager-trust-manager-rhel9:1790598593
- rhaiis/model-opt-cuda-rhel9:1790621714
- rhaiis/vllm-cuda-rhel9:1790621718
- rhaiis/vllm-rocm-rhel9:1790621713
- rhaii/vllm-rocm-rhel9:1791425869
- rhaii/vllm-gaudi-rhel9:1791427182
- rhaii/model-opt-cuda-rhel9:1791803821
- rhaii/vllm-cuda-rhel9:1791473631
- RHSA-2026:57015
- RHSA-2026:65767
- RHSA-2026:65773
- RHSA-2026:61766
- RHSA-2026:65762
- RHSA-2026:65769
- RHSA-2026:65771
- RHSA-2026:55440
- RHSA-2026:65768
- RHSA-2026:65770
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
More Red Hat Linux advisories
- CVE-2026-46300May 13, 2026"Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local
- CVE-2026-31431Apr 22, 2026algif_aead - Revert to operating out-of-place
- CVE-2026-34486Apr 9, 2026Missing Encryption of Sensitive Data due to EncryptInterceptor bypass
- CVE-2025-31277Mar 18, 2026Processing maliciously crafted web content may lead to memory corruption
- CVE-2026-64849Aug 17, 2026Unauthenticated full-read SSRF in webhook delivery: _validate_webhook_url bypassed
- CVE-2026-53362Jul 4, 2026account for fraggap on the paged allocation path
iPhone and Android apps · New on the App Store
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.