CVE-2024-26831

KUnit test failure via deferred file cleanup

Published Apr 17, 2024 · Updated May 23, 2026

Availability issue in affected Linux builds allows local users to interrupt the handshake request-destruction KUnit test. The handshake_req_destroy_test1 case calls fput(filp), which normally defers final close and cleanup, then compares a pointer before the hp_destroy callback is guaranteed to finish. Exposure requires the net/handshake KUnit test to be built into the kernel; the reported consequence is a failed kernel test rather than a demonstrated production-service outage.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability issue in affected Linux builds allows local users to interrupt the handshake request-destruction KUnit test. The handshake_req_destroy_test1 case calls fput(filp), which normally defers final close and cleanup, then compares a pointer before the hp_destroy callback is guaranteed to finish. Exposure requires the net/handshake KUnit test to be built into the kernel; the reported consequence is a failed kernel test rather than a demonstrated production-service outage.

The record

CVE
CVE-2024-26831
Published
Apr 17, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=1751e44980466e3ebc246d22d3ebd422197704b6
  2. Affected versionversion=4a0f07d71b0483cc08c03cefa7c85749e187c214 <4e1d71cabb19ec2586827adfc60d68689c68c194
  3. Affected versionversion=4a0f07d71b0483cc08c03cefa7c85749e187c214 <7f97805b8df6e33850e225e6bd3ebd9e246920af
  4. Affected versionversion=4a0f07d71b0483cc08c03cefa7c85749e187c214 <d74226e03df1bf19848f18344401f254345af912
  5. Affected versionversion=6.5.6 <6.6
  6. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1751e44980466e3ebc246d22d3ebd422197704b6; version=4a0f07d71b0483cc08c03cefa7c85749e187c214 <4e1d71cabb19ec2586827adfc60d68689c68c194; version=4a0f07d71b0483cc08c03cefa7c85749e187c214 <7f97805b8df6e33850e225e6bd3ebd9e246920af; version=4a0f07d71b0483cc08c03cefa7c85749e187c214 <d74226e03df1bf19848f18344401f254345af912; version=6.5.6 <6.6; version=6.6

Published CVSS scores

5.5NIST NVDCVSS: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-401Missing Release of Memory after Effective Lifetime

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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