High 7.8Published Aug 28, 2026

CVE-2026-80622char: tlclk: fix use-after-free in tlclk_cleanup()

Updated under an hour ago (Oct 27, 2026, 1:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1a80ba88273097933f93b1f40537337416798c70 before 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a; from 1a80ba88273097933f93b1f40537337416798c70 before 96902299a22d126ef5eb3f45cd5d8ceea9e6a735; from 1a80ba88273097933f93b1f40537337416798c70 before 166dd1d5265e067459e674c11688919901813ec2; from 1a80ba88273097933f93b1f40537337416798c70 before 764723bd67a6c8f53a8d8309211fb039e2ebcf49; from 1a80ba88273097933f93b1f40537337416798c70 before c3f0cd76561ae611c2d247ee96dfd559e4197cb7; from 1a80ba88273097933f93b1f40537337416798c70 before 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f; from 1a80ba88273097933f93b1f40537337416798c70 before 42223445607a9a5df3cb1c4729abfe3a5085e7ce; from 1a80ba88273097933f93b1f40537337416798c70 before bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1	CNA record

References

References

https://git.kernel.org/stable/c/09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a
https://git.kernel.org/stable/c/96902299a22d126ef5eb3f45cd5d8ceea9e6a735
https://git.kernel.org/stable/c/166dd1d5265e067459e674c11688919901813ec2
https://git.kernel.org/stable/c/764723bd67a6c8f53a8d8309211fb039e2ebcf49
https://git.kernel.org/stable/c/c3f0cd76561ae611c2d247ee96dfd559e4197cb7
https://git.kernel.org/stable/c/3d5e4cc0d9dce79b0429da3134ac7b072ab9009f
https://git.kernel.org/stable/c/42223445607a9a5df3cb1c4729abfe3a5085e7ce
https://git.kernel.org/stable/c/bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.