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Advisory severityMedium4.0Red Hat Linux

Medium [CVE-2026-40467] Denial of Service due to Use After Free vulnerability in io.c

This medium-severity Red Hat Linux advisory covers CVE-2026-40467 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-40467 Source published Source updated

VulniPulse record published

CVE-2026-40467
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

Use After Free vulnerability has been found in "io.c" program file of gawk (do_getline_redir() routine). This issue may lead to a crash.

It affects gawk in versions 5.4.0 and below. A flaw was found in gawk.

This vulnerability can be triggered by an attacker, potentially leading to a system crash and causing a Denial of Service (DoS). This flaw, affecting gawk in Red Hat Hardened Images, requires a local attacker with low privileges to trick a user into interacting with specially crafted input, limiting its immediate impact.

Red Hat severity: Moderate — CVSS 4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-825.

Affected Red Hat products: Red Hat Hardened Images; 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 fixing advisory: RHSA-2026:40041, RHSA-2026:49661.

Affected products named by the advisory: Red Hat package: gawk.

Affected versions
  • 5.4.0

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Fixed versions
  • gawk-main-5.4.0-3.1.hum1
  • gawk-main-5.4.1-1.hum1
  • RHSA-2026:40041
  • RHSA-2026:49661

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this issue, users should avoid processing untrusted or maliciously crafted input with `gawk`. Exercise caution when executing `gawk` scripts or commands that process data from unknown or unverified sources.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

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