CVE-2026-3904

Application crash via concurrent nscd cache comparison

Published Mar 11, 2026 · Updated Mar 11, 2026

Denial of service in GNU Project glibc 2.35 through 2.36 allows local users to crash nscd clients and dependent applications. The nscd client passes cache data that another thread or process can modify concurrently to optimized x86_64 memcmp, invoking undefined behavior that can crash the caller. Reachability requires high nscd load, an affected x86_64 memcmp implementation, and an NSS-backed function using nscd caching; the resulting process crash interrupts the calling application.

CVSS severity6.2
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in GNU Project glibc 2.35 through 2.36 allows local users to crash nscd clients and dependent applications. The nscd client passes cache data that another thread or process can modify concurrently to optimized x86_64 memcmp, invoking undefined behavior that can crash the caller. Reachability requires high nscd load, an affected x86_64 memcmp implementation, and an NSS-backed function using nscd caching; the resulting process crash interrupts the calling application.

The record

CVE
CVE-2026-3904
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
The GnuPG Project
Product
glibc
Classifications
CWE-366, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.35 <2.37

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The GnuPG Project · glibcversion=2.35 <2.37

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-366Race Condition Within a Thread
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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