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Fencer Vulns
high 7.8

CVE-2024-26622 json

tomoyo: fix UAF write bug in tomoyo_write_control()

published 2024-03-04 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-23884

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

tomoyo: fix UAF write bug in tomoyo_write_control()

Since tomoyo_write_control() updates head->write_buf when write() of long lines is requested, we need to fetch head->write_buf after head->io_sem is held. Otherwise, concurrent write() requests can cause use-after-free-write and double-free problems.

Patch / fix

  • Linux Linux 5.10.212, 5.15.151, 6.1.81, 6.6.21, 6.7.9, 6.8
  • linux Debian 12 6.1.82-1
  • linux Debian 14, Debian 13 6.7.9-1

debian advisories DEBIAN-CVE-2024-26622

  • linux Ubuntu 20.04 LTS 5.4.0-182.202
  • linux Ubuntu 22.04 LTS 5.15.0-107.117
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1125.135
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1062.68
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1129.138
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1060.68
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1059.64
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1072.77

ubuntu advisories UBUNTU-CVE-2024-26622

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-livepatch-SLE15-SP5_Update_10 SLE Live Patching 15 SP5 13-150500.11.8.1
  • kernel-livepatch-SLE15-SP4_Update_23 SLE Live Patching 15 SP4 13-150400.9.8.1
  • kernel-livepatch-SLE15-SP5_Update_10 SLE Live Patching 15 SP5 12-150500.11.8.1
  • kernel-livepatch-SLE15-SP4_Update_23 SLE Live Patching 15 SP4 12-150400.9.8.1
  • kernel-livepatch-SLE15-SP4_Update_23 SLE Live Patching 15 SP4 11-150400.9.8.1
  • kernel-livepatch-SLE15-SP5_Update_10 SLE Live Patching 15 SP5 11-150500.11.8.1
  • kernel-livepatch-SLE15-SP5-RT_Update_10 SLE Live Patching 15 SP5 11-150500.11.8.1
  • kernel-livepatch-SLE15-SP5_Update_10 SLE Live Patching 15 SP5 10-150500.11.8.1

suse advisories SUSE-SU-2025:0266-1SUSE-SU-2025:0261-1SUSE-SU-2025:0158-1SUSE-SU-2025:0107-1SUSE-SU-2024:4234-1SUSE-SU-2024:4218-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-26622 updated cvss 6.2

kernel: tomoyo: fix UAF write bug in tomoyo_write_control()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.