CVE-2024-26622: tomoyo: fix UAF write bug in tomoyo_write_control()

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-04 · updated 2026-06-17
Weakness: CWE-416

Description

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.

Affected products

Linux kernel: from 3.1 before 5.10.212; from 5.11 before 5.15.151; from 5.16 before 6.1.81; from 6.2 before 6.6.21; from 6.7 before 6.7.9; 6.8-rc1, 6.8-rc2, 6.8-rc3, 6.8-rc4, 6.8-rc5, 6.8-rc6 — fixed in 5.10.212, 5.15.151, 6.1.81, 6.6.21, 6.7.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.212, 5.15.151, 6.1.81, 6.6.21. Check the vendor advisory for mitigations.

References

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