{"id":"CVE-2026-53192","summary":"ALSA: timer: Fix UAF at snd_timer_user_params()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: timer: Fix UAF at snd_timer_user_params()\n\nAt releasing a timer object, e.g. when a userspace timer\n(CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it\ntries to detach the timer instances and release the resources.\nHowever, it's still possible that other in-flight tasks are holding\nthe timer instance where the to-be-deleted timer object is associated,\nand this may lead to racy accesses.\n\nFortunately, most of ioctls dealing with the timer instance list\nalready have the protection with register_mutex, and this also avoids\nsuch races.  But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the\nconcurrent ioctl may lead to use-after-free.\n\nThis patch just adds the guard with register_mutex to protect\nsnd_timer_user_params() for covering the code path as a quick\nworkaround.  It's no hot-path but rather a rarely issued ioctl, so the\nperformance penalty doesn't matter.","modified":"2026-07-08T08:09:46.223620811Z","published":"2026-06-25T08:39:03.696Z","related":["CGA-ggfx-hrxw-9wcg"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53192.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11"},{"type":"WEB","url":"https://git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53192.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53192"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"37745918e0e7575bc40f38da93a99b9fa6406224"},{"fixed":"38034d04d4a75bbca01df2b313ced0bcd0fa3242"},{"fixed":"3d39da65b5c422c5e5afb7d5651b0698d060a827"},{"fixed":"306427adf9b97e29e5958cb9cf3096c6151fc9ff"},{"fixed":"053a401b592be424fea9d57c789f66cd5d8cec11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53192.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53192.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}