CVE-2025-39994 (GCVE-0-2025-39994)

Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2026-10-15 22:02
VLAI
Title
media: tuner: xc5000: Fix use-after-free in xc5000_release
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]
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:55 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8 (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < e2f5eaafc0306a76fb1cb760aae804b065b8a341 (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < 3f876cd47ed8bca1e28d68435845949f51f90703 (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < df0303b4839520b84d9367c2fad65b13650a4d42 (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < 71ed8b81a4906cb785966910f39cf7f5ad60a69e (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < effb1c19583bca7022fa641a70766de45c6d41ac (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < 9a00de20ed8ba90888479749b87bc1532cded4ce (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < 4266f012806fc18e46da4a04d130df59a4946f93 (git)
Affected: f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 , < 40b7a19f321e65789612ebaca966472055dab48c (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.111 , ≤ 6.6.* (semver)
Unaffected: 6.12.51 , ≤ 6.12.* (semver)
Unaffected: 6.16.11 , ≤ 6.16.* (semver)
Unaffected: 6.17.1 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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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              "lang": "en",
              "value": "AV:L - Both halves are software-local: the attacker arms the 5-second `timer_sleep` work through the local `/dev/dvb/adapterN/frontend0` or `/dev/videoN` device node, and the freeing `dvb_frontend_detach()` path is entered by a local write to `/sys/bus/pci/devices/\u003cdev\u003e/remove`/`unbind` or `rmmod` on the PCIe xc5000 cards (cx23885, cx88, saa7134), with no network, adjacent-network, or remote-peer data path into `xc5000_release()`.\nAC:L - The attacker fully controls the arming side with deterministic timing \u2014 `dvb_shutdown_timeout` defaults to 0, so closing the frontend immediately triggers `xc5000_sleep()` and the work fires exactly 5 s later \u2014 and the callback then executes for roughly 350 ms on cx231xx boards (`msleep(10)+msleep(330)+msleep(10)` in `cx231xx_tuner_callback()`), an enormous window that can be re-armed indefinitely for free; once it is hit, `cancel_delayed_work()` cannot steal a running work item and the use-after-free is unconditional.\nPR:L - Arming the vulnerable work requires nothing more than opening and closing the DVB frontend or V4L2 video node, which systemd tags with `uaccess` (and which is group `video` on media appliances, set-top boxes and DVR/kiosk systems), so an ordinary unprivileged local account suffices; no capability, user namespace, or root is needed on the attacker-controlled side.\nUI:R - Completing the exploit needs the free itself, which only occurs on driver teardown \u2014 an administrator running `rmmod`/`unbind`, or a user unplugging the USB TV tuner \u2014 an action the unprivileged attacker cannot perform, so a separate user must act while the primed work is executing.\nS:U - The corruption is confined to kernel heap objects (the freed `struct xc5000_priv` and whatever reclaims its kmalloc-192 slot) within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `xc5000_do_timer_sleep()` reads `priv-\u003efe` out of the freed slab and `xc5000_tuner_reset()` then dereferences `fe-\u003edvb`, `fe-\u003edvb-\u003epriv` and `priv-\u003ei2c_props.adap-\u003ealgo_data`, so spraying the kmalloc-192 cache turns the dangling pointer into an arbitrary-address read chain and leaks kernel pointers that defeat KASLR.\nI:H - `xc5000_tuner_reset()` performs `fe-\u003ecallback(...)` where `fe` was loaded from the freed object, giving a fully attacker-controlled indirect call with a controlled first argument once the slab is reclaimed \u2014 a direct control-flow hijack primitive, not merely a stray read.\nA:H - Dereferencing the freed `xc5000_priv` from workqueue context reliably produces a KASAN slab-use-after-free splat and an oops/panic (and the bogus function-pointer call faults in kernel context), taking the system down."
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        {
          "url": "https://git.kernel.org/stable/c/e2f5eaafc0306a76fb1cb760aae804b065b8a341"
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      "title": "media: tuner: xc5000: Fix use-after-free in xc5000_release",
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    "cveId": "CVE-2025-39994",
    "datePublished": "2025-10-15T07:58:19.503Z",
    "dateReserved": "2025-04-16T07:20:57.150Z",
    "dateUpdated": "2026-10-15T22:02:35.851Z",
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      "cve": "CVE-2025-39994",
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      "source": "Microsoft CSAF VEX",
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      "title": "media: tuner: xc5000: Fix use-after-free in xc5000_release",
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                    "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]"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: tuner: xc5000: Corrige uso despu\u00e9s de liberaci\u00f3n en xc5000_release\n\nEl c\u00f3digo original utiliza cancel_delayed_work() en xc5000_release(), lo que no garantiza que el elemento de trabajo retrasado timer_sleep haya completado totalmente si ya estaba en ejecuci\u00f3n. Esto lleva a escenarios de uso despu\u00e9s de liberaci\u00f3n donde xc5000_release() puede liberar el xc5000_priv mientras timer_sleep todav\u00eda est\u00e1 activo e intenta desreferenciar el xc5000_priv.\n\nUna condici\u00f3n de carrera t\u00edpica se ilustra a continuaci\u00f3n:\n\nCPU 0 (hilo de liberaci\u00f3n)                 | CPU 1 (callback de trabajo retrasado)\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\nReemplace cancel_delayed_work() con cancel_delayed_work_sync() para asegurar que el timer_sleep sea cancelado correctamente antes de que la memoria de xc5000_priv sea desasignada.\n\nSe consider\u00f3 una preocupaci\u00f3n por interbloqueo: xc5000_release() es llamado en un contexto de proceso y no est\u00e1 reteniendo ning\u00fan bloqueo que el elemento de trabajo timer_sleep tambi\u00e9n pudiera necesitar. Por lo tanto, el uso de la variante _sync() es seguro aqu\u00ed.\n\nEste error fue inicialmente identificado mediante an\u00e1lisis est\u00e1tico.\n\n[hverkuil: corrige error tipogr\u00e1fico en Asunto: tunner -\u003e tuner]"
          }
        ],
        "id": "CVE-2025-39994",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.3,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.3,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2025-39994",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:55:59.194469Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-05T12:51:12+00:00",
      "cve": "CVE-2025-39994",
      "id": "CVE-2025-39994",
      "initial_release_date": "2025-10-15T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_not_affected": "227",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-after-free in xc5000 tuner driver due to race condition",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39994.json",
      "version": "3"
    }
  }
}



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