CVE-2025-39819 Affecting kernel6.12-debuginfo-common-aarch64 package, versions <1:6.12.46-66.121.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNEL612DEBUGINFOCOMMONAARCH64-13170861
  • published1 Oct 2025
  • disclosed16 Sept 2025

Introduced: 16 Sep 2025

NewCVE-2025-39819  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel6.12-debuginfo-common-aarch64 to version 1:6.12.46-66.121.amzn2023 or higher.
This issue was patched in ALAS2023-2025-1208.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel6.12-debuginfo-common-aarch64 package and not the kernel6.12-debuginfo-common-aarch64 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

fs/smb: Fix inconsistent refcnt update

A possible inconsistent update of refcount was identified in smb2_compound_op. Such inconsistent update could lead to possible resource leaks.

Why it is a possible bug:

  1. In the comment section of the function, it clearly states that the reference to cfile should be dropped after calling this function.
  2. Every control flow path would check and drop the reference to cfile, except the patched one.
  3. Existing callers would not handle refcount update of cfile if -ENOMEM is returned.

To fix the bug, an extra goto label "out" is added, to make sure that the cleanup logic would always be respected. As the problem is caused by the allocation failure of vars, the cleanup logic between label "finished" and "out" can be safely ignored. According to the definition of function is_replayable_error, the error code of "-ENOMEM" is not recoverable. Therefore, the replay logic also gets ignored.

CVSS Base Scores

version 3.1