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CVE-2026-3904

25
FAUCET Score

CVE-2026-3904 describes a crash vulnerability in the GNU C Library (glibc) versions 2.36 and 2.35 on x86_64 systems. Under high load, the nscd client, when calling NSS-backed functions, can crash due to an optimized memcmp implementation encountering concurrently modified inputs. This local vulnerability is rated Medium (CVSS 6.2), with low attack complexity, primarily impacting system availability by causing the nscd client and dependent applications to crash. There is no evidence of active exploitation, public exploit code availability, or significant community attention for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.35, < 2.37CPE matchmatch criteria
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.2MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.15%
Probability of exploitation in next 30 days
EPSS Percentile
4.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0015 is in the 10th percentile among its peer group of 3,049 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2026-Mar/CVE-2026-3904Moderate

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

Mar 10, 2026

References

cert-portal.siemens.com / productcert/html/ssa-082556.html
sourceware.org / bugzilla/show_bug.cgi
ExploitIssue TrackingPatch
sourceware.org / git
Third Party Advisory
sourceware.org / git
Patch
sourceware.org / git
Patch
openwall.com / lists/oss-security/2026/03/11/5
Mailing ListThird Party Advisory