CVE-2026-80622 (GCVE-0-2026-80622)
Vulnerability from cvelistv5
Published
2026-08-28 06:48
Modified
2026-10-16 19:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
Version: 1a80ba88273097933f93b1f40537337416798c70
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UAF during driver teardown reliably threatens system availability even when not fully weaponized.\"}]}], \"affected\": [{\"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\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a\"}, {\"url\": \"https://git.kernel.org/stable/c/96902299a22d126ef5eb3f45cd5d8ceea9e6a735\"}, {\"url\": \"https://git.kernel.org/stable/c/166dd1d5265e067459e674c11688919901813ec2\"}, {\"url\": \"https://git.kernel.org/stable/c/764723bd67a6c8f53a8d8309211fb039e2ebcf49\"}, {\"url\": \"https://git.kernel.org/stable/c/c3f0cd76561ae611c2d247ee96dfd559e4197cb7\"}, {\"url\": \"https://git.kernel.org/stable/c/3d5e4cc0d9dce79b0429da3134ac7b072ab9009f\"}, {\"url\": \"https://git.kernel.org/stable/c/42223445607a9a5df3cb1c4729abfe3a5085e7ce\"}, {\"url\": \"https://git.kernel.org/stable/c/bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nchar: tlclk: fix use-after-free in tlclk_cleanup()\\n\\nThis patch improves the module cleanup process in the tlclk driver to\\nprevent potential use-after-free and race conditions.\\n\\nCurrently, the file_operations structure does not specify the .owner\\nfield, which could allow the module to be unloaded while user-space\\nprocesses are still interacting with the device. Additionally, the\\ntlclk_cleanup() function frees the alarm_events memory before ensuring\\nthat blocked processes in the waitqueue are fully awakened and that the\\nswitchover_timer has completed.\\n\\nTo address these cases, this patch:\\n- Sets \u0027.owner = THIS_MODULE\u0027 in tlclk_fops to safely defer module\\n  unloading while the device is in use.\\n- Updates tlclk_cleanup() to explicitly wake up all blocked readers\\n  (wake_up_all), properly release hardware I/O regions, and safely\\n  delete the timer (timer_delete_sync) prior to freeing memory.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"2.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-29T06:21:27.766Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-80622\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:26:30.961Z\", \"dateReserved\": \"2026-08-26T14:34:25.775Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-28T06:48:41.744Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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