# CVE-2026-40467: Use after free in gawk CVE-2026-40467 is fixed in 6 products on 1 platform, first by gawk 1:5.3.2-1ubuntu1.1, released July 13, 2026. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2026-40467 - Priority: Routine - CVSS: 6.2 (Moderate) - EPSS: 0.0021 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 13, 2026 - Weakness: Use After Free - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40467 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | gawk RHEL 10 | 5.3.0-6.el10_2.1 | [RHSA-2026:73429](https://patchblox.com/security/data/fix/linux/rhsa-2026-73429.md) | Jul 13, 2026 | | Linux | gawk RHEL 8 | 0:4.2.1-5.el8_10 | [RHSA-2026:73511](https://patchblox.com/security/data/fix/linux/rhsa-2026-73511.md) | Oct 2, 2026 | | Linux | gawk RHEL 9 | 0:5.1.0-6.el9_8.1 | [RHSA-2026:73512](https://patchblox.com/security/data/fix/linux/rhsa-2026-73512.md) | Sep 30, 2026 | | Linux | gawk Ubuntu 18.04.6 LTS (bionic) | 1:4.1.4+dfsg-1ubuntu0.1~esm2 | [gawk 1:4.1.4+dfsg-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-gawk-1-4.1.4-dfsg-1ubuntu0.1-esm2.md) | Jul 24, 2026 | | Linux | gawk Ubuntu 20.04 LTS (focal) | 1:5.0.1+dfsg-1ubuntu0.1+esm1 | [gawk 1:5.0.1+dfsg-1ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gawk-1-5.0.1-dfsg-1ubuntu0.1-esm1.md) | Jul 24, 2026 | | Linux | gawk Ubuntu 22.04.1 LTS (jammy) | 1:5.1.0-1ubuntu0.2 | [gawk 1:5.1.0-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gawk-1-5.1.0-1ubuntu0.2.md) | Jul 24, 2026 | | Linux | gawk Ubuntu 24.04.5 LTS (noble) | 1:5.2.1-2ubuntu0.1 | [gawk 1:5.2.1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gawk-1-5.2.1-2ubuntu0.1.md) | Jul 24, 2026 | | Linux | gawk Ubuntu 26.04.1 LTS (resolute) | 1:5.3.2-1ubuntu1.1 | [gawk 1:5.3.2-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gawk-1-5.3.2-1ubuntu1.1.md) | Jul 13, 2026 | | Linux | gawk almalinux 10 | 5.3.0-6.el10_2.1 | [ALSA-2026:73429](https://patchblox.com/security/data/fix/linux/alsa-2026-73429.md) | Sep 29, 2026 | | Linux | gawk almalinux 8 | 4.2.1-5.el8_10 | [ALSA-2026:73511](https://patchblox.com/security/data/fix/linux/alsa-2026-73511.md) | Sep 29, 2026 | | Linux | gawk almalinux 9 | 5.1.0-6.el9_8.1 | [ALSA-2026:73512](https://patchblox.com/security/data/fix/linux/alsa-2026-73512.md) | Sep 29, 2026 | | Linux | gawk amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | | Linux | gawk ol 10 | 0:5.3.0-6.el10_2.1 | [ELSA-2026-73429](https://patchblox.com/security/data/fix/linux/elsa-2026-73429.md) | Sep 30, 2026 | | Linux | gawk ol 8 | 0:4.2.1-5.el8_10 | [ELSA-2026-73511](https://patchblox.com/security/data/fix/linux/elsa-2026-73511.md) | Sep 30, 2026 | | Linux | gawk ol 9 | 0:5.1.0-6.el9_8.1 | [ELSA-2026-73512](https://patchblox.com/security/data/fix/linux/elsa-2026-73512.md) | Sep 30, 2026 | | Linux | gawk opensuse-leap 16.0 | 5.3.2-160000.3.1 | [OPENSUSE-SU-2026:21393-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21393-1.md) | Jul 20, 2026 | | Linux | gawk rocky 10 | 0:5.3.0-6.el10_2.1 | [RLSA-2026:73429](https://patchblox.com/security/data/fix/linux/rlsa-2026-73429.md) | Sep 30, 2026 | | Linux | gawk rocky 8 | 0:4.2.1-5.el8_10 | [RLSA-2026:73511](https://patchblox.com/security/data/fix/linux/rlsa-2026-73511.md) | Oct 2, 2026 | | Linux | gawk rocky 9 | 0:5.1.0-6.el9_8.1 | [RLSA-2026:73512](https://patchblox.com/security/data/fix/linux/rlsa-2026-73512.md) | Sep 30, 2026 | | Linux | gawk sles 15.7 | 4.2.1-150000.3.6.1 | [SUSE-SU-2026:3455-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3455-1.md) | Aug 3, 2026 | | Linux | gawk sles 16.0 | 5.3.2-160000.3.1 | [SUSE-SU-2026:22831-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22831-1.md) | Jul 20, 2026 | | Linux | gawk-all-langpacks RHEL 9 | 0:5.1.0-6.el9_8.1 | [RHSA-2026:73512](https://patchblox.com/security/data/fix/linux/rhsa-2026-73512.md) | Sep 30, 2026 | | Linux | gawk-all-langpacks almalinux 10 | 5.3.0-6.el10_2.1 | [ALSA-2026:73429](https://patchblox.com/security/data/fix/linux/alsa-2026-73429.md) | Sep 29, 2026 | | Linux | gawk-all-langpacks almalinux 9 | 5.1.0-6.el9_8.1 | [ALSA-2026:73512](https://patchblox.com/security/data/fix/linux/alsa-2026-73512.md) | Sep 29, 2026 | | Linux | gawk-all-langpacks amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | | Linux | gawk-all-langpacks ol 10 | 0:5.3.0-6.el10_2.1 | [ELSA-2026-73429](https://patchblox.com/security/data/fix/linux/elsa-2026-73429.md) | Sep 30, 2026 | | Linux | gawk-all-langpacks ol 9 | 0:5.1.0-6.el9_8.1 | [ELSA-2026-73512](https://patchblox.com/security/data/fix/linux/elsa-2026-73512.md) | Sep 30, 2026 | | Linux | gawk-debuginfo amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | | Linux | gawk-debugsource amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | | Linux | gawk-devel amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | | Linux | gawk-doc amzn 2023 | 5.1.0-3.amzn2023.0.4 | [ALAS2023-2026-2035](https://patchblox.com/security/data/fix/linux/alas2023-2026-2035.md) | Aug 3, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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