char: tlclk: fix use-after-free in tlclk_cleanup()
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.
CVE-2026-80622
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80622
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "96902299a22d126ef5eb3f45cd5d8ceea9e6a735",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "166dd1d5265e067459e674c11688919901813ec2",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "764723bd67a6c8f53a8d8309211fb039e2ebcf49",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "c3f0cd76561ae611c2d247ee96dfd559e4197cb7",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "3d5e4cc0d9dce79b0429da3134ac7b072ab9009f",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "42223445607a9a5df3cb1c4729abfe3a5085e7ce",
"versionType": "git"
},
{
"status": "affected",
"version": "1a80ba88273097933f93b1f40537337416798c70",
"lessThan": "bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1",
"versionType": "git"
}
],
"programFiles": [
"drivers/char/tlclk.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/char/tlclk.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80622
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34348 · Revision 1
- Added to Heist Feed
- Publisher date