CVE-2023-6246
Glibc: heap-based buffer overflow in __vsyslog_internal()
- Published
- Jan 31, 2024
- Updated
- Jul 14, 2026
- Assigning CNA
- redhat
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 91.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
A 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 the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.
Sources
2CVE-2023-6246 glibc __vsyslog_internal() heap buffer overflow exploitation using Convergent Time Theory (α = 0.0302011). 33-layer temporal heap spray + phase-locked trigger for reliable local privilege escalation.
C-based proof-of-concept exploit for CVE-2023-6246, targeting a privilege escalation vulnerability in the Linux kernel's syscalls. Tested on Fedora WS 38.
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