CVE-2024-26622

Kernel memory corruption via concurrent TOMOYO writes

Published Mar 4, 2024 · Updated May 11, 2026

Use-after-free in TOMOYO policy control in Linux allows local users to corrupt kernel memory through concurrent long-line writes. tomoyo_write_control() reads head->write_buf before taking head->io_sem, while another writer can replace and free that buffer, leading to a stale-buffer write and double free. Exploitation requires write access to a TOMOYO control file and overlapping writes; successful triggering can corrupt kernel memory or crash the system.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in TOMOYO policy control in Linux allows local users to corrupt kernel memory through concurrent long-line writes. tomoyo_write_control() reads head->write_buf before taking head->io_sem, while another writer can replace and free that buffer, leading to a stale-buffer write and double free. Exploitation requires write access to a TOMOYO control file and overlapping writes; successful triggering can corrupt kernel memory or crash the system.

The record

CVE
CVE-2024-26622
Published
Mar 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 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=3.1
  2. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <2caa605079488da9601099fbda460cfc1702839f
  3. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <2f03fc340cac9ea1dc63cbf8c93dd2eb0f227815
  4. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <3bfe04c1273d30b866f4c7c238331ed3b08e5824
  5. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <6edefe1b6c29a9932f558a898968a9fcbeec5711
  6. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <7d930a4da17958f869ef679ee0e4a8729337affc
  7. Affected versionversion=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <a23ac1788e2c828c097119e9a3178f0b7e503fee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <2caa605079488da9601099fbda460cfc1702839f; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <2f03fc340cac9ea1dc63cbf8c93dd2eb0f227815; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <3bfe04c1273d30b866f4c7c238331ed3b08e5824; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <6edefe1b6c29a9932f558a898968a9fcbeec5711; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <7d930a4da17958f869ef679ee0e4a8729337affc; version=bd03a3e4c9a9df0c6b007045fa7fc8889111a478 <a23ac1788e2c828c097119e9a3178f0b7e503fee

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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