CVE-2024-26631

Kernel code execution via IPv6 multicast race

Published Mar 18, 2024 · Updated Aug 5, 2026

Race condition in the Linux kernel allows local users to execute code in kernel context through concurrent IPv6 multicast operations. The ipv6_mc_down path and mld_ifc_work update idev->mc_ifc_count concurrently because stop-work calls run without the required mc_lock mutex. Repeated multicast work and interface-down operations can underflow an inet6_dev reference, causing use-after-free, kernel code execution, an oops, or a teardown hang.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel allows local users to execute code in kernel context through concurrent IPv6 multicast operations. The ipv6_mc_down path and mld_ifc_work update idev->mc_ifc_count concurrently because stop-work calls run without the required mc_lock mutex. Repeated multicast work and interface-down operations can underflow an inet6_dev reference, causing use-after-free, kernel code execution, an oops, or a teardown hang.

The record

CVE
CVE-2024-26631
Published
Mar 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 <75ddcd741d2a30696f5893bc71a9d28f4ef22311
  2. Affected versionversion=2d9a93b4902be6a5504b5941dd15e9cd776aadca <2e7ef287f07c74985f1bf2858bedc62bd9ebf155
  3. Affected versionversion=2d9a93b4902be6a5504b5941dd15e9cd776aadca <380540bb06bb1d1b12bdc947d1b8f56cda6b5663
  4. Affected versionversion=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3bb5849675ae1d592929798a2b37ea450879c855
  5. Affected versionversion=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3cc283fd16fba72e2cefe3a6f48d7a36b0438900
  6. Affected versionversion=2d9a93b4902be6a5504b5941dd15e9cd776aadca <62b3387beef11738eb6ce667601a28fa089fa02c
  7. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 <75ddcd741d2a30696f5893bc71a9d28f4ef22311; version=2d9a93b4902be6a5504b5941dd15e9cd776aadca <2e7ef287f07c74985f1bf2858bedc62bd9ebf155; version=2d9a93b4902be6a5504b5941dd15e9cd776aadca <380540bb06bb1d1b12bdc947d1b8f56cda6b5663; version=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3bb5849675ae1d592929798a2b37ea450879c855; version=2d9a93b4902be6a5504b5941dd15e9cd776aadca <3cc283fd16fba72e2cefe3a6f48d7a36b0438900; version=2d9a93b4902be6a5504b5941dd15e9cd776aadca <62b3387beef11738eb6ce667601a28fa089fa02c; version=5.13

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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