RHSA-2026:79281MediumCVSS 5.9

Red Hat Security Advisory: glibc security, bug fix, and enhancement update

Published
October 8, 2026
Last Modified
October 14, 2026

🔗 CVE IDs covered (6)

CVE-2026-6368 →CVE-2026-6791 →CVE-2026-18374 →CVE-2026-19542 →CVE-2026-77117 →CVE-2026-80489 →

📋 Description

CVE-2026-6368 — glibc: glibc: Process abort due to invalid memory in wordexp CVE-2026-6791 — glibc: Glibc: Denial of Service via stack exhaustion during tilde expansion CVE-2026-18374 — glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string CVE-2026-19542 — glibc: Fix out-of-bounds array write in tdelete CVE-2026-77117 — glibc: Non-progress DoS in SHIFT_JISX0213 -&gt CVE-2026-80489 — glibc: Non-progress DoS in EUC_JISX0213 -> UCS-4 conversion state

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream (v. 9)
  • Red Hat Enterprise Linux BaseOS (v. 9)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-0:2.34-283.el9_8.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-0:2.34-283.el9_8.src as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-0:2.34-283.el9_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-all-langpacks-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-all-langpacks-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-all-langpacks-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-all-langpacks-0:2.34-283.el9_8.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-benchtests-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-0:2.34-283.el9_8.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.i686 as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.i686 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)
  • glibc-benchtests-debuginfo-0:2.34-283.el9_8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 9)
  • +170 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: 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. Workaround: This issue is reachable only through applications that use glibc's tsearch/tdelete APIs and allow construction of extremely deep trees (on the order of a million nodes). Restrict such services to trusted clients and enforce process memory limits so large tree growth is impractical. Workaround: Do not convert untrusted input using the SHIFT_JISX0213 character set (for example via iconv). Where conversion cannot be avoided, apply process CPU time limits and container cgroup resource limits so a hung converter cannot exhaust host resources. Workaround: To mitigate this avoid converting untrusted data with that charset, or disable the conversion path if unused. Where conversion of untrusted input cannot be avoided, restrict access to trusted clients and apply process CPU/resource limits to contain hang impact.

🔗 References (9)