smb: client: fix cifsFileInfo reference leak in deferred close

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97558
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:06 UTC
Updated2026-09-25 15:17:59 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: smb: client: fix cifsFileInfo reference leak in deferred close When cifs_close() defers a close, it hands the cifsFileInfo reference of the closing struct file to the queued work. Each execution of smb2_deferred_work_close() drops one such reference. deferred_close_scheduled can be false while the work is pending: the workqueue clears PENDING when the callback starts to run, before the callback clears the flag under deferred_lock. A close in that interval requeues the running work, and the callback then clears the flag, leaving the requeued work pending with the flag down. A later cifs_open() can reuse the handle and its cifs_close() reaches the same branch: queue_delayed_work() fails because the work is still pending, but cifs_close() returns without dropping the closing file's reference. The cifsFileInfo count stays pinned and its tlink, dentry and server handle are leaked. Check the return value and hand off the reference only when work was actually queued. Otherwise, use the shared _cifsFileInfo_put(), like the mod_delayed_work() branch above: the pending execution already owns its reference. This issue was found by an in-house static analysis tool.

Risk And Classification

EPSS: 0.002130000 probability, percentile 0.103990000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c3f207ab29f793b8c942ce8067ed123f18d5b81b a6767712902beb0f53238be485971c9a83ea1079 git Not specified
CNA Linux Linux affected c3f207ab29f793b8c942ce8067ed123f18d5b81b ea93759d6c2789924f4e557aed5be532207715ea git Not specified
CNA Linux Linux affected c3f207ab29f793b8c942ce8067ed123f18d5b81b 5520e89a5a4f834bced64cf2ac927001cc513a40 git Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a6767712902beb0f53238be485971c9a83ea1079 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ea93759d6c2789924f4e557aed5be532207715ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5520e89a5a4f834bced64cf2ac927001cc513a40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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