CVE-2026-80622
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.
How to fix
- Linux Linux09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a, 96902299a22d126ef5eb3f45cd5d8ceea9e6a735, 166dd1d5265e067459e674c11688919901813ec2, 764723bd67a6c8f53a8d8309211fb039e2ebcf49, c3f0cd76561ae611c2d247ee96dfd559e4197cb7, 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f, 42223445607a9a5df3cb1c4729abfe3a5085e7ce, bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 96902299a22d126ef5eb3f45cd5d8ceea9e6a735, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 166dd1d5265e067459e674c11688919901813ec2, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 764723bd67a6c8f53a8d8309211fb039e2ebcf49, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < c3f0cd76561ae611c2d247ee96dfd559e4197cb7, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < 42223445607a9a5df3cb1c4729abfe3a5085e7ce, 1a80ba88273097933f93b1f40537337416798c70 ≤ v < bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1, 2.6.15 | 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a, 96902299a22d126ef5eb3f45cd5d8ceea9e6a735, 166dd1d5265e067459e674c11688919901813ec2, 764723bd67a6c8f53a8d8309211fb039e2ebcf49, c3f0cd76561ae611c2d247ee96dfd559e4197cb7, 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f, 42223445607a9a5df3cb1c4729abfe3a5085e7ce, bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1 |
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