{"id":"CVE-2026-80622","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80622","summary":"char: tlclk: fix use-after-free in tlclk_cleanup()","details":"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 '.owner = THIS_MODULE' 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.","published":"2026-08-28T06:48:41.744Z","modified":"2026-08-29T03:47:04.035054893Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.261"}],"fix":null,"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/09d8d2a46a9ec9ff728f3159a174a2ab25dd0f0a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/166dd1d5265e067459e674c11688919901813ec2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d5e4cc0d9dce79b0429da3134ac7b072ab9009f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42223445607a9a5df3cb1c4729abfe3a5085e7ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/764723bd67a6c8f53a8d8309211fb039e2ebcf49"},{"type":"WEB","url":"https://git.kernel.org/stable/c/96902299a22d126ef5eb3f45cd5d8ceea9e6a735"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bbf003b7794d6ad6f939fdd29f1f1bde8ac554c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c3f0cd76561ae611c2d247ee96dfd559e4197cb7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80622.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80622"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-29T03:47:04.035054893Z"}}