FKIE_CVE-2025-39994

Vulnerability from fkie_nvd - Published: 2025-10-15 08:15 - Updated: 2026-06-17 09:18
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/3f876cd47ed8bca1e28d68435845949f51f90703
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/bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df0303b4839520b84d9367c2fad65b13650a4d42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2f5eaafc0306a76fb1cb760aae804b065b8a341
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/effb1c19583bca7022fa641a70766de45c6d41ac
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/tuners/xc5000.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "e2f5eaafc0306a76fb1cb760aae804b065b8a341",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "3f876cd47ed8bca1e28d68435845949f51f90703",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "df0303b4839520b84d9367c2fad65b13650a4d42",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "71ed8b81a4906cb785966910f39cf7f5ad60a69e",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "effb1c19583bca7022fa641a70766de45c6d41ac",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "9a00de20ed8ba90888479749b87bc1532cded4ce",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "4266f012806fc18e46da4a04d130df59a4946f93",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            },
            {
              "lessThan": "40b7a19f321e65789612ebaca966472055dab48c",
              "status": "affected",
              "version": "f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/tuners/xc5000.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.16"
            },
            {
              "lessThan": "3.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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]"
    }
  ],
  "id": "CVE-2025-39994",
  "lastModified": "2026-06-17T09:18:58.630",
  "metrics": {},
  "published": "2025-10-15T08:15:37.567",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f876cd47ed8bca1e28d68435845949f51f90703"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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/bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8"
    },
    {
      "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/e2f5eaafc0306a76fb1cb760aae804b065b8a341"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/effb1c19583bca7022fa641a70766de45c6d41ac"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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