Memory Handling Vulnerability in GNU C Library Affects NSS Client
CVE-2026-3904

6.2MEDIUM

Key Information:

Vendor

The Gnu C Library

Status
Glibc
Vendor
CVE Published:
11 March 2026

What is CVE-2026-3904?

The NSS client in GNU C Library versions 2.35 and 2.36 may experience a crash under high-load circumstances due to concurrent modifications of inputs used by the optimized memcmp function. When accessed, this undefined behavior can lead to spurious cache misses and a subsequent crash of both the nscd client and the applications relying on it. Distributions that utilize a cherry-picked version of the memcpy SSE2 optimization must also implement the necessary fixes to prevent this potential instability.

Affected Version(s)

glibc x86 2.35 < 2.37

References

https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=ad...
https://sourceware.org/bugzilla/show_bug.cgi?id=29863
https://sourceware.org/git/?p=glibc.git;a=commit;h=880415...

CVSS V3.1

Score:
6.2
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.