CVE catalog

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 i

[CVE catalog]

Severity: Medium · CVSS 6.2
Published: Mar 11, 2026, 1:19:09 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.15% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	glibc	sid	`2.43-7`	fixed
Debian	glibc	forky	`2.43-7`	fixed
Debian	glibc	trixie	`2.41-12+deb13u4`	fixed
Debian	glibc	bookworm	`2.36-9+deb12u14`	fixed
Debian	glibc	bookworm-security	`2.36-9+deb12u7`	fixed
Cpe	glibc	Not reported	`2.36-9`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	glibc	source	sid	`2.36-9`	not yet assigned	Not reported	[1033931]
Debian	glibc	source	forky	`2.36-9`	not yet assigned	Not reported	[1033931]
Debian	glibc	source	trixie	`2.36-9`	not yet assigned	Not reported	[1033931]
Debian	glibc	source	bookworm	`2.36-9`	not yet assigned	Not reported	[1033931]
Cpe	glibc	cpe	Not reported	`2.36-9`	Not reported	Not reported	Not reported

[Debian bug #1033931]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[glibc-doc]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[glibc-source]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-dbg]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-dev]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-dev-i386]Fixed
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-dev-x32]Fixed
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-i386]Fixed
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc6-x32]Fixed
Source package: [glibc]
Details (2)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc-bin]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc-dev-bin]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc-devtools]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[libc-l10n]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[locales]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · all · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · all · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[locales-all]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
[nscd]Fixed
Source package: [glibc]
Details (4)
- 2.36-9+deb12u14 · amd64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u14 · arm64 · bookworm
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · amd64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12
- 2.36-9+deb12u7 · arm64 · bookworm-security
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · bookworm; nvd · glibc · debian · 12

[Debian 13 (Trixie)]

[glibc-doc]Fixed
Source package: [glibc]
Details (2)
- 2.41-12+deb13u3 · all · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
- 2.41-12+deb13u3 · all · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
[glibc-source]Fixed
Source package: [glibc]
Details (2)
- 2.41-12+deb13u3 · all · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
- 2.41-12+deb13u3 · all · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
[libc6]Fixed
Source package: [glibc]
Details (2)
- 2.41-12+deb13u3 · amd64 · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
- 2.41-12+deb13u3 · arm64 · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
[libc6-dbg]Fixed
Source package: [glibc]
Details (2)
- 2.41-12+deb13u3 · amd64 · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13
- 2.41-12+deb13u3 · arm64 · trixie
  Fixed · Fixed: 2.36-9
  nvd · glibc · debian · 13

Next results

Observed: Oct 24, 2026, 12:37:17 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]