{"id":"CVE-2025-39994","summary":"media: tuner: xc5000: Fix use-after-free in xc5000_release","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: tuner: xc5000: Fix use-after-free in xc5000_release\n\nThe original code uses cancel_delayed_work() in xc5000_release(), which\ndoes not guarantee that the delayed work item timer_sleep has fully\ncompleted if it was already running. This leads to use-after-free scenarios\nwhere xc5000_release() may free the xc5000_priv while timer_sleep is still\nactive and attempts to dereference the xc5000_priv.\n\nA typical race condition is illustrated below:\n\nCPU 0 (release thread)                 | CPU 1 (delayed work callback)\nxc5000_release()                       | xc5000_do_timer_sleep()\n  cancel_delayed_work()                |\n  hybrid_tuner_release_state(priv)     |\n    kfree(priv)                        |\n                                       |   priv = container_of() // UAF\n\nReplace cancel_delayed_work() with cancel_delayed_work_sync() to ensure\nthat the timer_sleep is properly canceled before the xc5000_priv memory\nis deallocated.\n\nA deadlock concern was considered: xc5000_release() is called in a process\ncontext and is not holding any locks that the timer_sleep work item might\nalso need. Therefore, the use of the _sync() variant is safe here.\n\nThis bug was initially identified through static analysis.\n\n[hverkuil: fix typo in Subject: tunner -\u003e tuner]","modified":"2026-05-18T05:58:07.460746871Z","published":"2025-10-15T07:58:19.503Z","related":["SUSE-SU-2025:21040-1","SUSE-SU-2025:21052-1","SUSE-SU-2025:21056-1","SUSE-SU-2025:21064-1","SUSE-SU-2025:21080-1","SUSE-SU-2025:21147-1","SUSE-SU-2025:21180-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4128-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4140-1","SUSE-SU-2025:4141-1","SUSE-SU-2025:4301-1","openSUSE-SU-2025:15671-1","openSUSE-SU-2025:20091-1","openSUSE-SU-2026:10301-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39994.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3f876cd47ed8bca1e28d68435845949f51f90703"},{"type":"WEB","url":"https://git.kernel.org/stable/c/40b7a19f321e65789612ebaca966472055dab48c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4266f012806fc18e46da4a04d130df59a4946f93"},{"type":"WEB","url":"https://git.kernel.org/stable/c/71ed8b81a4906cb785966910f39cf7f5ad60a69e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a00de20ed8ba90888479749b87bc1532cded4ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df0303b4839520b84d9367c2fad65b13650a4d42"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2f5eaafc0306a76fb1cb760aae804b065b8a341"},{"type":"WEB","url":"https://git.kernel.org/stable/c/effb1c19583bca7022fa641a70766de45c6d41ac"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39994.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-39994"},{"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":"f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8"},{"fixed":"bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8"},{"fixed":"e2f5eaafc0306a76fb1cb760aae804b065b8a341"},{"fixed":"3f876cd47ed8bca1e28d68435845949f51f90703"},{"fixed":"df0303b4839520b84d9367c2fad65b13650a4d42"},{"fixed":"71ed8b81a4906cb785966910f39cf7f5ad60a69e"},{"fixed":"effb1c19583bca7022fa641a70766de45c6d41ac"},{"fixed":"9a00de20ed8ba90888479749b87bc1532cded4ce"},{"fixed":"4266f012806fc18e46da4a04d130df59a4946f93"},{"fixed":"40b7a19f321e65789612ebaca966472055dab48c"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39994.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.16.0"},{"fixed":"5.4.301"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.246"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.195"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.156"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.16.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.17.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39994.json"}}],"schema_version":"1.7.5"}