Heap Buffer Overflow in gdbserver’s QTDPsrc Packet Handler
CVE-2026-121997

8.1HIGH

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-2026-121997?

A heap buffer overflow vulnerability in the QTDPsrc packet handler of gdbserver enables unauthenticated remote attackers to execute arbitrary code within the gdbserver process. This security flaw arises from a discrepancy between the declared source length of a packet and the actual data length. This mismatch can lead to writing beyond the allocated buffer, potentially compromising system integrity. Administrators should ensure that they apply the latest patches to mitigate the risks associated with this vulnerability.

References

https://access.redhat.com/security/cve/CVE-2026-121997
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2565679
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
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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