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CVE PROGRAM SOURCE RECORD7.3 High

CVE-2025-39994

media: tuner: xc5000: Fix use-after-free in xc5000_release

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8affected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < e2f5eaafc0306a76fb1cb760aae804b065b8a341affected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < 3f876cd47ed8bca1e28d68435845949f51f90703affected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < df0303b4839520b84d9367c2fad65b13650a4d42affected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < 71ed8b81a4906cb785966910f39cf7f5ad60a69eaffected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < effb1c19583bca7022fa641a70766de45c6d41acaffected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < 9a00de20ed8ba90888479749b87bc1532cded4ceaffected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < 4266f012806fc18e46da4a04d130df59a4946f93affected
  • f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 to < 40b7a19f321e65789612ebaca966472055dab48caffected

Linux Linux

Default version status: affected

  • 3.16affected
  • 0 to < 3.16unaffected
  • 5.4.301 to ≤ 5.4.*unaffected
  • 5.10.246 to ≤ 5.10.*unaffected
  • 5.15.195 to ≤ 5.15.*unaffected
  • 6.1.156 to ≤ 6.1.*unaffected
  • 6.6.111 to ≤ 6.6.*unaffected
  • 6.12.51 to ≤ 6.12.*unaffected
  • 6.16.11 to ≤ 6.16.*unaffected
  • 6.17.1 to ≤ 6.17.*unaffected
  • 6.18 to ≤ *unaffected

References