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.

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Fixes

Solution

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Workaround

There is no mitigation for this vulnerability. Users should only connect GDB to trusted debug targets.

History

Thu, 05 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
Weaknesses CWE-121
CPEs cpe:/a:redhat:enterprise_linux:10
cpe:/a:redhat:enterprise_linux:8
cpe:/a:redhat:enterprise_linux:9
cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:rhel_els:6
cpe:/o:redhat:rhel_els:7
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-05T16:08:49.660Z

Reserved: 2026-11-04T13:28:12.839Z

Link: CVE-2026-121995

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-05T17:18:00.690

Modified: 2026-11-05T17:18:00.820

Link: CVE-2026-121995

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses