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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80622
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:46 UTC
Updated2026-08-29 07:16:46 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001760000 probability, percentile 0.072390000 (date 2026-08-28)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 96902299a22d126ef5eb3f45cd5d8ceea9e6a735 git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 166dd1d5265e067459e674c11688919901813ec2 git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 764723bd67a6c8f53a8d8309211fb039e2ebcf49 git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 c3f0cd76561ae611c2d247ee96dfd559e4197cb7 git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 3d5e4cc0d9dce79b0429da3134ac7b072ab9009f git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 42223445607a9a5df3cb1c4729abfe3a5085e7ce git Not specified
CNA Linux Linux affected 1a80ba88273097933f93b1f40537337416798c70 bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1 git Not specified
CNA Linux Linux affected 2.6.15 Not specified
CNA Linux Linux unaffected 2.6.15 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c3f0cd76561ae611c2d247ee96dfd559e4197cb7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/166dd1d5265e067459e674c11688919901813ec2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/764723bd67a6c8f53a8d8309211fb039e2ebcf49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/96902299a22d126ef5eb3f45cd5d8ceea9e6a735 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42223445607a9a5df3cb1c4729abfe3a5085e7ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3d5e4cc0d9dce79b0429da3134ac7b072ab9009f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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