CVE-2024-26781

Local kernel hang via MPTCP diagnostic lock inversion

Published Apr 4, 2024 · Updated May 11, 2026

Improper locking in Linux MPTCP diagnostics allows local users to hang affected kernels by requesting subflow listener data. The subflow_get_info path takes a socket lock while inet_diag_dump_icsk already holds the listener hash lock, reversing an existing dependency; the fix skips extended data for MPTCP subflow listeners. A low-privileged local user must issue the diagnostic Netlink request, and the resulting circular wait interrupts system availability without disclosed data access or modification.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux MPTCP diagnostics allows local users to hang affected kernels by requesting subflow listener data. The subflow_get_info path takes a socket lock while inet_diag_dump_icsk already holds the listener hash lock, reversing an existing dependency; the fix skips extended data for MPTCP subflow listeners. A low-privileged local user must issue the diagnostic Netlink request, and the resulting circular wait interrupts system availability without disclosed data access or modification.

The record

CVE
CVE-2024-26781
Published
Apr 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 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=298ac00da8e6bc2dcd690b45108acbd944c347d3 <d487e7ba1bc7444d5f062c4930ef8436c47c7e63
  2. Affected versionversion=5.10.211 <5.10.212
  3. Affected versionversion=5.15.150 <5.15.151
  4. Affected versionversion=6.1.80 <6.1.81
  5. Affected versionversion=6.6.19 <6.6.21
  6. Affected versionversion=6.7.7 <6.7.9
  7. Affected versionversion=71787c665d09a970b9280c285181d3a2d1bf3bb0 <f27d319df055629480b84b9288a502337b6f2a2e
  8. Affected versionversion=7d6e8d7ee13b876e762b11f4ec210876ab7aec84 <cc32ba2fdf3f8b136619fff551f166ba51ec856d
  9. Affected versionversion=8affdbb3e2ef6b6a3a467b87dc336dc601dc2ed9 <70e5b013538d5e4cb421afed431a5fcd2a5d49ee
  10. Affected versionversion=b8adb69a7d29c2d33eb327bca66476fb6066516b <d6a9608af9a75d13243d217f6ce1e30e57d56ffe
  11. Affected versionversion=e074c8297ee421e7ff352404262fe0e042954ab7 <fa8c776f4c323a9fbc8ddf25edcb962083391430

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=298ac00da8e6bc2dcd690b45108acbd944c347d3 <d487e7ba1bc7444d5f062c4930ef8436c47c7e63; version=5.10.211 <5.10.212; version=5.15.150 <5.15.151; version=6.1.80 <6.1.81; version=6.6.19 <6.6.21; version=6.7.7 <6.7.9; version=71787c665d09a970b9280c285181d3a2d1bf3bb0 <f27d319df055629480b84b9288a502337b6f2a2e; version=7d6e8d7ee13b876e762b11f4ec210876ab7aec84 <cc32ba2fdf3f8b136619fff551f166ba51ec856d; version=8affdbb3e2ef6b6a3a467b87dc336dc601dc2ed9 <70e5b013538d5e4cb421afed431a5fcd2a5d49ee; version=b8adb69a7d29c2d33eb327bca66476fb6066516b <d6a9608af9a75d13243d217f6ce1e30e57d56ffe; version=e074c8297ee421e7ff352404262fe0e042954ab7 <fa8c776f4c323a9fbc8ddf25edcb962083391430

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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
T1499Endpoint Denial of Service

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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