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CVE-2025-39994

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.111, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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]

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in e2f5eaafc0306a76fb1cb760aae804b065b8a341; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in 3f876cd47ed8bca1e28d68435845949f51f90703; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in df0303b4839520b84d9367c2fad65b13650a4d42; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in 71ed8b81a4906cb785966910f39cf7f5ad60a69e; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in effb1c19583bca7022fa641a70766de45c6d41ac; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in 9a00de20ed8ba90888479749b87bc1532cded4ce; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in 4266f012806fc18e46da4a04d130df59a4946f93; From f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 · fixed in 40b7a19f321e65789612ebaca966472055dab48c

  • Linux Linux

    3.16

  • KernelLinux

    From 3.16.0 · fixed in 5.4.301; From 5.5.0 · fixed in 5.10.246; From 5.11.0 · fixed in 5.15.195; From 5.16.0 · fixed in 6.1.156; From 6.2.0 · fixed in 6.6.111; From 6.7.0 · fixed in 6.12.51; From 6.13.0 · fixed in 6.16.11; From 6.17.0 · fixed in 6.17.1

References 9

git.kernel.org