# CVE-2023-3138: libx11: A vulnerability was found in libX11 CVE-2023-3138 is fixed in 11 products on 1 platform, first by libx11-6 2:1.6.4-3ubuntu0.4+esm1, released June 14, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-3138 - Priority: High - CVSS: 7.5 (high) - EPSS: 0.0166 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 14, 2023 ## Description A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libX11 RHEL 8 | 0:1.6.8-6.el8 | [RHSA-2023:7029](https://patchblox.com/security/data/fix/linux/rhsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11 RHEL 9 | 0:1.7.0-8.el9 | [RHSA-2023:6497](https://patchblox.com/security/data/fix/linux/rhsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11 almalinux 8 | 1.6.8-6.el8 | [ALSA-2023:7029](https://patchblox.com/security/data/fix/linux/alsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11 almalinux 9 | 1.7.0-8.el9 | [ALSA-2023:6497](https://patchblox.com/security/data/fix/linux/alsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11 amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11 ol 8 | 0:1.6.8-6.el8 | [ELSA-2023-7029](https://patchblox.com/security/data/fix/linux/elsa-2023-7029.md) | Nov 17, 2023 | | Linux | libX11 ol 9 | 0:1.7.0-8.el9 | [ELSA-2023-6497](https://patchblox.com/security/data/fix/linux/elsa-2023-6497.md) | Nov 11, 2023 | | Linux | libX11-common RHEL 8 | 0:1.6.8-6.el8 | [RHSA-2023:7029](https://patchblox.com/security/data/fix/linux/rhsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-common RHEL 9 | 0:1.7.0-8.el9 | [RHSA-2023:6497](https://patchblox.com/security/data/fix/linux/rhsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-common almalinux 8 | 1.6.8-6.el8 | [ALSA-2023:7029](https://patchblox.com/security/data/fix/linux/alsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-common almalinux 9 | 1.7.0-8.el9 | [ALSA-2023:6497](https://patchblox.com/security/data/fix/linux/alsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-common amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11-common ol 8 | 0:1.6.8-6.el8 | [ELSA-2023-7029](https://patchblox.com/security/data/fix/linux/elsa-2023-7029.md) | Nov 17, 2023 | | Linux | libX11-common ol 9 | 0:1.7.0-8.el9 | [ELSA-2023-6497](https://patchblox.com/security/data/fix/linux/elsa-2023-6497.md) | Nov 11, 2023 | | Linux | libX11-debuginfo amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11-debugsource amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11-devel RHEL 8 | 0:1.6.8-6.el8 | [RHSA-2023:7029](https://patchblox.com/security/data/fix/linux/rhsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-devel RHEL 9 | 0:1.7.0-8.el9 | [RHSA-2023:6497](https://patchblox.com/security/data/fix/linux/rhsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-devel almalinux 8 | 1.6.8-6.el8 | [ALSA-2023:7029](https://patchblox.com/security/data/fix/linux/alsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-devel almalinux 9 | 1.7.0-8.el9 | [ALSA-2023:6497](https://patchblox.com/security/data/fix/linux/alsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-devel amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11-devel ol 8 | 0:1.6.8-6.el8 | [ELSA-2023-7029](https://patchblox.com/security/data/fix/linux/elsa-2023-7029.md) | Nov 17, 2023 | | Linux | libX11-devel ol 9 | 0:1.7.0-8.el9 | [ELSA-2023-6497](https://patchblox.com/security/data/fix/linux/elsa-2023-6497.md) | Nov 11, 2023 | | Linux | libX11-xcb RHEL 8 | 0:1.6.8-6.el8 | [RHSA-2023:7029](https://patchblox.com/security/data/fix/linux/rhsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-xcb RHEL 9 | 0:1.7.0-8.el9 | [RHSA-2023:6497](https://patchblox.com/security/data/fix/linux/rhsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-xcb almalinux 8 | 1.6.8-6.el8 | [ALSA-2023:7029](https://patchblox.com/security/data/fix/linux/alsa-2023-7029.md) | Nov 14, 2023 | | Linux | libX11-xcb almalinux 9 | 1.7.0-8.el9 | [ALSA-2023:6497](https://patchblox.com/security/data/fix/linux/alsa-2023-6497.md) | Nov 7, 2023 | | Linux | libX11-xcb amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libX11-xcb ol 8 | 0:1.6.8-6.el8 | [ELSA-2023-7029](https://patchblox.com/security/data/fix/linux/elsa-2023-7029.md) | Nov 17, 2023 | | Linux | libX11-xcb ol 9 | 0:1.7.0-8.el9 | [ELSA-2023-6497](https://patchblox.com/security/data/fix/linux/elsa-2023-6497.md) | Nov 11, 2023 | | Linux | libX11-xcb-debuginfo amzn 2023 | 1.7.2-3.amzn2023.0.3 | [ALAS2023-2023-250](https://patchblox.com/security/data/fix/linux/alas2023-2023-250.md) | Jul 17, 2023 | | Linux | libx11 Debian 11.6 (bullseye) | 2:1.7.2-1+deb11u1 | [DSA-5433-1](https://patchblox.com/security/data/fix/linux/dsa-5433-1.md) | Jun 21, 2023 | | Linux | libx11 Debian 12.15 (bookworm) | 2:1.8.4-2+deb12u1 | [DSA-5433-1](https://patchblox.com/security/data/fix/linux/dsa-5433-1.md) | Jun 21, 2023 | | Linux | libx11 Debian 13.5 (trixie) | 2:1.8.6-1 | [DEBIAN-CVE-2023-3138](https://patchblox.com/security/data/fix/linux/debian-cve-2023-3138.md) | Jun 28, 2023 | | Linux | libx11 Debian 14 | 2:1.8.6-1 | [DEBIAN-CVE-2023-3138](https://patchblox.com/security/data/fix/linux/debian-cve-2023-3138.md) | Jun 28, 2023 | | Linux | libx11-6 Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm1 | [libx11-6 2:1.6.4-3ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-6-2-1.6.4-3ubuntu0.4-esm1.md) | Jun 14, 2023 | | Linux | libx11-6 Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.5 | [libx11-6 2:1.6.9-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-6-2-1.6.9-2ubuntu1.5.md) | Jun 14, 2023 | | Linux | libx11-6 Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.2 | [libx11-6 2:1.7.5-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-6-2-1.7.5-1ubuntu0.2.md) | Jun 14, 2023 | | Linux | libx11-data Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm1 | [libx11-data 2:1.6.4-3ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-data-2-1.6.4-3ubuntu0.4-esm1.md) | Jun 14, 2023 | | Linux | libx11-data Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.5 | [libx11-data 2:1.6.9-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-data-2-1.6.9-2ubuntu1.5.md) | Jun 14, 2023 | | Linux | libx11-data Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.2 | [libx11-data 2:1.7.5-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-data-2-1.7.5-1ubuntu0.2.md) | Jun 14, 2023 | | Linux | libx11-xcb1 Ubuntu 18.04.6 LTS (bionic) | 2:1.6.4-3ubuntu0.4+esm1 | [libx11-xcb1 2:1.6.4-3ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libx11-xcb1-2-1.6.4-3ubuntu0.4-esm1.md) | Jun 14, 2023 | | Linux | libx11-xcb1 Ubuntu 20.04 LTS (focal) | 2:1.6.9-2ubuntu1.5 | [libx11-xcb1 2:1.6.9-2ubuntu1.5](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libx11-xcb1-2-1.6.9-2ubuntu1.5.md) | Jun 14, 2023 | | Linux | libx11-xcb1 Ubuntu 22.04.1 LTS (jammy) | 2:1.7.5-1ubuntu0.2 | [libx11-xcb1 2:1.7.5-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libx11-xcb1-2-1.7.5-1ubuntu0.2.md) | Jun 14, 2023 | --- Data as of 2026-11-08T00:53:09Z UTC. 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