CVE-2025-39994

High

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]

Package Linux Kernel
Published 2025-10-15
Last modified 2026-07-30
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.3

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 3.16 and later are affected. Fixed in 5.4.301, 5.10.246, 5.15.195, 6.1.156, 6.6.111, 6.12.51, 6.16.11, 6.17.1, 6.18 and their respective stable series.

Affected from
≥ 3.16
Fixed in
✓ 5.4.301 5.4.x ✓ 5.10.246 5.10.x ✓ 5.15.195 5.15.x ✓ 6.1.156 6.1.x ✓ 6.6.111 6.6.x ✓ 6.12.51 6.12.x ✓ 6.16.11 6.16.x ✓ 6.17.1 6.17.x ✓ 6.18

References

9 total
Showing 5 of 9 references View all on NVD

Frequently asked questions

  • What is CVE-2025-39994?

    CVE-2025-39994 is a High severity Linux kernel vulnerability with a CVSS score of 7.3 out of 10 . It affects Linux kernel versions from 3.16 onward and has been patched in 5.4.301, 5.10.246, 5.15.195 and others. CVE-2025-39994 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2025-39994?

    CVE-2025-39994 has a CVSS score of 7.3 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2025-39994?

    Yes. CVE-2025-39994 has been patched. Fixed versions include 5.4.301, 5.10.246, 5.15.195 and others. If you are running Linux kernel 3.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2025-39994 actively exploited?

    No. CVE-2025-39994 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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