# CVE-2023-6779: glibc: An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library CVE-2023-6779 is fixed in 17 products on 1 platform, first by glibc-source 2.39-0ubuntu1, released January 30, 2024. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-6779 - Priority: High - CVSS: 7.5 (high) - EPSS: 0.0315 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 30, 2024 ## Description An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | glibc Debian 12.15 (bookworm) | 2.36-9+deb12u4 | [DEBIAN-CVE-2023-6779](https://patchblox.com/security/data/fix/linux/debian-cve-2023-6779.md) | Jan 31, 2024 | | Linux | glibc Debian 13.5 (trixie) | 2.37-15 | [DEBIAN-CVE-2023-6779](https://patchblox.com/security/data/fix/linux/debian-cve-2023-6779.md) | Jan 31, 2024 | | Linux | glibc Debian 14 | 2.37-15 | [DEBIAN-CVE-2023-6779](https://patchblox.com/security/data/fix/linux/debian-cve-2023-6779.md) | Jan 31, 2024 | | Linux | glibc-source Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [glibc-source 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-glibc-source-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc-bin Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc-bin 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc-bin-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc-dev-bin Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc-dev-bin 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc-dev-bin-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc-devtools Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc-devtools 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc-devtools-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-amd64 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-amd64 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-amd64-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-dev-amd64 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-dev-amd64 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-dev-amd64-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-dev-i386 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-dev-i386 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-dev-i386-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-dev-s390 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-dev-s390 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-dev-s390-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-dev-x32 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-dev-x32 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-dev-x32-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-i386 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-i386 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-i386-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-s390 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-s390 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-s390-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | libc6-x32 Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [libc6-x32 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libc6-x32-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | locales Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [locales 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-locales-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | locales-all Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [locales-all 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-locales-all-2.39-0ubuntu1.md) | Jan 30, 2024 | | Linux | nscd Ubuntu 24.04.5 LTS (noble) | 2.39-0ubuntu1 | [nscd 2.39-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-nscd-2.39-0ubuntu1.md) | Jan 30, 2024 | --- Data as of 2026-11-08T00:53:09Z UTC. 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