Vulnerability · Published Nov 5, 2026 · Assigned by redhat
CVE-2026-121995Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail
High 7.5
In plain English
A high-severity stack buffer overflow in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 78.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A stack buffer overflow in the GDB client's tracepoint upload handler allows an attacker-controlled debug stub to corrupt stack memory automatically during connection setup. The overflow results from GDB reading beyond the current reply boundary into a stale prior reply in the shared packet buffer.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | gdb | no fix listed | DEBIAN-CVE-2026-121995 |
| Debian:13 | gdb | no fix listed | DEBIAN-CVE-2026-121995 |
| Debian:14 | gdb | no fix listed | DEBIAN-CVE-2026-121995 |
| Ubuntu:22.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-121995 |
| Ubuntu:24.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-121995 |
| Ubuntu:26.04:LTS | gdb | no fix listed | UBUNTU-CVE-2026-121995 |
| Ubuntu:26.10 | gdb | no fix listed | UBUNTU-CVE-2026-121995 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Hardened Images | see references |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-121995 vdb-entry, x_refsource_REDHAT
- RHBZ#2565677 issue-tracking, x_refsource_REDHAT