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CVE-2026-80622

char: tlclk: fix use-after-free in tlclk_cleanup()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: char: tlclk: fix use-after-free in tlclk_cleanup() This patch improves the module cleanup process in the tlclk driver to prevent potential use-after-free and race conditions. Currently, the file_operations structure does not specify the .owner field, which could allow the module to be unloaded while user-space processes are still interacting with the device. Additionally, the tlclk_cleanup() function frees the alarm_events memory before ensuring that blocked processes in the waitqueue are fully awakened and that the switchover_timer has completed. To address these cases, this patch: • Sets '.owner = THIS_MODULE' in tlclk_fops to safely defer module unloading while the device is in use. • Updates tlclk_cleanup() to explicitly wake up all blocked readers (wake_up_all), properly release hardware I/O regions, and safely delete the timer (timer_delete_sync) prior to freeing memory.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 96902299a22d126ef5eb3f45cd5d8ceea9e6a735; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 166dd1d5265e067459e674c11688919901813ec2; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 764723bd67a6c8f53a8d8309211fb039e2ebcf49; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in c3f0cd76561ae611c2d247ee96dfd559e4197cb7; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in 42223445607a9a5df3cb1c4729abfe3a5085e7ce; From 1a80ba88273097933f93b1f40537337416798c70 · fixed in bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1

  • Linux Linux

    2.6.15

  • KernelLinux

    From 2.6.15 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org