Skip to content
Fencer Vulns
high 7.5

CVE-2026-121995 json

Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail

published 2026-11-05 3 d ago modified 2026-11-06 2 d ago also EUVD-2026-117572

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-121995 updated cvss 7.5

gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail

  • Red Hat Enterprise Linux 6 gdb, gdb-gdbserver, gdb 17.2-4.el10_3 Red Hat Enterprise Linux 7 gdb-gdbserver, gdb 17.2-4.el10_3 Red Hat Enterprise Linux 8 gdb, gdb-headless, gdb-gdbserver, gdb 17.2-4.el10_3, gcc-toolset-14-gdb 14.2-3.el8_10, gcc-toolset-15-gdb 16.3-1.el8_10 Red Hat Enterprise Linux 9 gdb, gdb-minimal, gdb-headless, gdb-gdbserver, gdb 17.2-4.el10_3 Red Hat Enterprise Linux 10 gdb 17.2-4.el10_3 Red Hat Hardened Images gdb 17.2-4.el10_3
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 8 crash 8.0.6-1.el10 Red Hat Enterprise Linux 9 crash 8.0.6-1.el10 Red Hat Enterprise Linux 10 crash 8.0.6-1.el10
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Hardened Images

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.