6.2

CVE-2026-3904

Exploit
Calling NSS-backed functions that support caching via nscd may call the 
nscd client side code and in the GNU C Library version 2.36 under high 
load on x86_64 systems, the client may call memcmp on inputs that are 
concurrently modified by other processes or threads and crash.




The nscd client in the GNU C Library uses the memcmp function with 
inputs that may be concurrently modified by another thread, potentially 
resulting in spurious cache misses, which in itself is not a security 
issue.  However in the GNU C Library version 2.36 an optimized 
implementation of memcmp was introduced for x86_64 which could crash 
when invoked with such undefined behaviour, turning this into a 
potential crash of the nscd client and the application that uses it. 
This implementation was backported to the 2.35 branch, making the nscd 
client in that branch vulnerable as well.  Subsequently, the fix for 
this issue was backported to all vulnerable branches in the GNU C 
Library repository.


It is advised that distributions that may have cherry-picked the memcpy 
SSE2 optimization in their copy of the GNU C Library, also apply the fix 
to avoid the potential crash in the nscd client.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Gnu ≫ Glibc Version >= 2.35 < 2.37
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.042
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 6.2 2.5 3.6
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-366 Race Condition within a Thread

If two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.

https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0004;hb=HEAD
Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=29863
Patch
Exploit
Issue Tracking
https://sourceware.org/git/?p=glibc.git;a=commit;h=8804157ad9da39631703b92315460808eac86b0c
Patch
https://sourceware.org/git/?p=glibc.git;a=commit;h=b712be52645282c706a5faa038242504feb06db5
Patch
http://www.openwall.com/lists/oss-security/2026/03/11/5
Third Party Advisory
Mailing List