Buffer Overflow in GDB Client Affects Red Hat Products
CVE-2026-121995

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
5 November 2026

What is CVE-2026-121995?

A stack buffer overflow in the GDB client’s tracepoint upload handler permits an attacker-controlled debug stub to corrupt stack memory during connection setup. This overflow occurs when GDB reads past the current reply boundary, accessing stale data from a previous reply stored in the shared packet buffer. Exploiting this vulnerability could allow for manipulation of the program's execution flow, leading to further security risks.

References

https://access.redhat.com/security/cve/CVE-2026-121995
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2565677
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Pulkit Singh Singaria for reporting this issue.
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