CVE-2026-121994 Gdb: gdb: stack buffer overflow in fetch_register_using_p via unchecked p-reply length
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121994?
CVE-2026-121994 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 5 Nov 2026.
Official description
A stack buffer overflow in the GDB client's remote protocol handler allows an attacker-controlled debug target to execute arbitrary code in the GDB process. The vulnerability exists in fetch_register_using_p, which decodes a stub's register reply into an alloca-sized buffer without bounding writes by the register width.
Weakness: CWE-121
Which versions are affected by CVE-2026-121994?
How do I fix CVE-2026-121994?
No fix has been published for CVE-2026-121994 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121994 being exploited?
There is no known exploitation of CVE-2026-121994 in the wild and no public exploit code.
Sources
Also known as AZL-113122, AZL-113149, DEBIAN-CVE-2026-121994, GHSA-8xgh-vfg7-p2g8, UBUNTU-CVE-2026-121994.