CVE-2025-39994 (GCVE-0-2025-39994)
Vulnerability from cvelistv5
Published
2025-10-15 07:58
Modified
2025-10-15 10:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: media: tuner: xc5000: Fix use-after-free in xc5000_release The original code uses cancel_delayed_work() in xc5000_release(), which does not guarantee that the delayed work item timer_sleep has fully completed if it was already running. This leads to use-after-free scenarios where xc5000_release() may free the xc5000_priv while timer_sleep is still active and attempts to dereference the xc5000_priv. A typical race condition is illustrated below: CPU 0 (release thread) | CPU 1 (delayed work callback) xc5000_release() | xc5000_do_timer_sleep() cancel_delayed_work() | hybrid_tuner_release_state(priv) | kfree(priv) | | priv = container_of() // UAF Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure that the timer_sleep is properly canceled before the xc5000_priv memory is deallocated. A deadlock concern was considered: xc5000_release() is called in a process context and is not holding any locks that the timer_sleep work item might also need. Therefore, the use of the _sync() variant is safe here. This bug was initially identified through static analysis. [hverkuil: fix typo in Subject: tunner -> tuner]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/40b7a19f321e65789612ebaca966472055dab48c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4266f012806fc18e46da4a04d130df59a4946f93
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71ed8b81a4906cb785966910f39cf7f5ad60a69e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a00de20ed8ba90888479749b87bc1532cded4ce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df0303b4839520b84d9367c2fad65b13650a4d42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/effb1c19583bca7022fa641a70766de45c6d41ac
Impacted products
Vendor Product Version
Linux Linux Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
Version: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8
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   Linux Linux Version: 3.16
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{
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          "programFiles": [
            "drivers/media/tuners/xc5000.c"
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          "value": "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]"
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      "providerMetadata": {
        "dateUpdated": "2025-10-15T10:22:24.152Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/40b7a19f321e65789612ebaca966472055dab48c"
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    "cveId": "CVE-2025-39994",
    "datePublished": "2025-10-15T07:58:19.503Z",
    "dateReserved": "2025-04-16T07:20:57.150Z",
    "dateUpdated": "2025-10-15T10:22:24.152Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39994\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-15T08:15:37.567\",\"lastModified\":\"2025-10-16T15:28:59.610\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/40b7a19f321e65789612ebaca966472055dab48c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4266f012806fc18e46da4a04d130df59a4946f93\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/71ed8b81a4906cb785966910f39cf7f5ad60a69e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a00de20ed8ba90888479749b87bc1532cded4ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df0303b4839520b84d9367c2fad65b13650a4d42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/effb1c19583bca7022fa641a70766de45c6d41ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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