CVE-2024-26732

Local denial of service via AF_UNIX lock inversion

Published Apr 3, 2024 · Updated May 11, 2026

Deadlock in the Linux kernel 6.7 through 6.7.6 allows local users to hang affected systems through concurrent AF_UNIX socket operations. setsockopt(SO_PEEK_OFF) takes sk_lock-AF_UNIX before unix_set_peek_off takes u->iolock, while the datagram receive path can acquire those locks in the reverse order. Low-privileged local access is required, and successful triggering blocks progress rather than exposing or altering data.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel 6.7 through 6.7.6 allows local users to hang affected systems through concurrent AF_UNIX socket operations. setsockopt(SO_PEEK_OFF) takes sk_lock-AF_UNIX before unix_set_peek_off takes u->iolock, while the datagram receive path can acquire those locks in the reverse order. Low-privileged local access is required, and successful triggering blocks progress rather than exposing or altering data.

The record

CVE
CVE-2024-26732
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. May 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=6.7
  2. Affected versionversion=859051dd165ec6cc915f0f2114699021144fd249 <56667da7399eb19af857e30f41bea89aa6fa812c
  3. Affected versionversion=859051dd165ec6cc915f0f2114699021144fd249 <897f75e2cde8a5f9f7529b55249af1fa4248c83b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=859051dd165ec6cc915f0f2114699021144fd249 <56667da7399eb19af857e30f41bea89aa6fa812c; version=859051dd165ec6cc915f0f2114699021144fd249 <897f75e2cde8a5f9f7529b55249af1fa4248c83b

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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