fs/smb: Fix inconsistent refcnt update

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39819
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-16 13:15:58 UTC
Updated2026-05-12 13:17:13 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a7d5c294628088781da9e91cbb034d61c3a71f71 3fc11ff13fbc2749871d6ac2141685cf54699997 git Not specified
CNA Linux Linux affected a7d5c294628088781da9e91cbb034d61c3a71f71 4191ea1f0bb3e27d65c5dcde7bd00e709ec67141 git Not specified
CNA Linux Linux affected a7d5c294628088781da9e91cbb034d61c3a71f71 4735f5991f51468b85affb8366b7067248457a71 git Not specified
CNA Linux Linux affected a7d5c294628088781da9e91cbb034d61c3a71f71 cc82c6dff548f0066a51a6e577c7454e7d26a968 git Not specified
CNA Linux Linux affected a7d5c294628088781da9e91cbb034d61c3a71f71 ab529e6ca1f67bcf31f3ea80c72bffde2e9e053e git Not specified
CNA Linux Linux affected 5.8 Not specified
CNA Linux Linux unaffected 5.8 semver Not specified
CNA Linux Linux unaffected 6.1.150 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.104 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.45 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.5 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4191ea1f0bb3e27d65c5dcde7bd00e709ec67141 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
git.kernel.org/stable/c/4735f5991f51468b85affb8366b7067248457a71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cc82c6dff548f0066a51a6e577c7454e7d26a968 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3fc11ff13fbc2749871d6ac2141685cf54699997 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/ab529e6ca1f67bcf31f3ea80c72bffde2e9e053e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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