CVE-2025-39819

Advisory lineage Upstream: 0 Downstream: 31
Modified
Published: 16 Sept 2025, 13:00
Last modified:12 May 2026, 12:07

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.03% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

16 Sept 2025, 13:00
Published
Vulnerability first disclosed
12 May 2026, 12:07
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.03%• Percentile: 10%

Affected Systems

  • debian•debian_linux

    11.0

  • linux•linux

    ≥ a7d5c294628088781da9e91cbb034d61c3a71f71, < 3fc11ff13fbc2749871d6ac2141685cf54699997 | ≥ a7d5c294628088781da9e91cbb034d61c3a71f71, < 4191ea1f0bb3e27d65c5dcde7bd00e709ec67141 | ≥ a7d5c294628088781da9e91cbb034d61c3a71f71, < 4735f5991f51468b85affb8366b7067248457a71 | ≥ a7d5c294628088781da9e91cbb034d61c3a71f71, < cc82c6dff548f0066a51a6e577c7454e7d26a968 | ≥ a7d5c294628088781da9e91cbb034d61c3a71f71, < ab529e6ca1f67bcf31f3ea80c72bffde2e9e053e | 5.8

  • linux•linux_kernel

    ≥ 5.8, < 6.1.150 | ≥ 6.2, < 6.6.104 | ≥ 6.7, < 6.12.45 | ≥ 6.13, < 6.16.5 | 6.17:rc1 | 6.17:rc2 | 6.17:rc3

References (7)