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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-80622

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1a80ba88273097933f93b1f40537337416798c70 to < 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0aaffected
  • 1a80ba88273097933f93b1f40537337416798c70 to < 96902299a22d126ef5eb3f45cd5d8ceea9e6a735affected
  • 1a80ba88273097933f93b1f40537337416798c70 to < 166dd1d5265e067459e674c11688919901813ec2affected
  • 1a80ba88273097933f93b1f40537337416798c70 to < 764723bd67a6c8f53a8d8309211fb039e2ebcf49affected
  • 1a80ba88273097933f93b1f40537337416798c70 to < c3f0cd76561ae611c2d247ee96dfd559e4197cb7affected
  • 1a80ba88273097933f93b1f40537337416798c70 to < 3d5e4cc0d9dce79b0429da3134ac7b072ab9009faffected
  • 1a80ba88273097933f93b1f40537337416798c70 to < 42223445607a9a5df3cb1c4729abfe3a5085e7ceaffected
  • 1a80ba88273097933f93b1f40537337416798c70 to < bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1affected

Linux Linux

Default version status: affected

  • 2.6.15affected
  • 0 to < 2.6.15unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References