Description
An issue was discovered in the GNU C Library (glibc) 2.36. When the syslog function is passed a crafted input string larger than 1024 bytes, it reads uninitialized memory from the heap and prints it to the target log file, potentially revealing a portion of the contents of the heap.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.36-3.1 | openSUSE-SU-2024:12316-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | glibc | 2.36-r1 | — |
Advisories 2
- openSUSE-SU-2024:12316-1 glibc-2.36-3.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2022-1234 GNU libc: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Oct 3, 2023
References
- https://sourceware.org/bugzilla/show_bug.cgi?id=29536
- https://security.netapp.com/advisory/ntap-20221104-0002/
- GLSA-202310-03 vendor-advisory
- [oss-security] 20240130 Re: CVE-2023-6246: Heap-based buffer overflow in the glibc's syslog() mailing-list
- [oss-security] 20240130 CVE-2023-6246: Heap-based buffer overflow in the glibc's syslog() mailing-list
- http://packetstormsecurity.com/files/176932/glibc-syslog-Heap-Based-Buffer-Overflow.html
- 20240204 CVE-2023-6246: Heap-based buffer overflow in the glibc's syslog() mailing-list