Buffer overflow in Red Hat Enterprise Linux 10
CVE-2026-121994
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-121994 (vdb-entry)
- RHBZ#2565676 (issue-tracking)
Frequently asked questions
- What is CVE-2026-121994?
- CVE-2026-121994 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-11-05.
- How severe is CVE-2026-121994?
- High severity. CVSS v3 base score is 8.8 out of 10.