CVE detail
CVE-2026-3904
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 19.5 · diversity 11.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
6 source links · newest first
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlcert-portal.siemens.com
No excerpt available.
Vendor Advisorycert-portal.siemens.comMar 11, 2026, 2:16 PM - http://www.openwall.com/lists/oss-security/2026/03/11/5www.openwall.com
No excerpt available.
Exploitwww.openwall.comMar 11, 2026, 2:16 PM - https://sourceware.org/git/?p=glibc.git;a=commit;h=b712be52645282c706a5faa038242504feb06db5sourceware.org
No excerpt available.
Exploitsourceware.orgMar 11, 2026, 2:16 PM - https://sourceware.org/git/?p=glibc.git;a=commit;h=8804157ad9da39631703b92315460808eac86b0csourceware.org
No excerpt available.
Exploitsourceware.orgMar 11, 2026, 2:16 PM - https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0004;hb=HEADsourceware.org
No excerpt available.
Exploitsourceware.orgMar 11, 2026, 2:16 PM - https://sourceware.org/bugzilla/show_bug.cgi?id=29863sourceware.org
No excerpt available.
Exploitsourceware.orgMar 11, 2026, 2:16 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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