cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68312
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:21 UTC
Updated2026-08-17 05:18:34 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths In cifs_close_deferred_file(), cifs_close_all_deferred_files(), and cifs_close_deferred_file_under_dentry(), when a pending deferred close is cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to add the file to the local processing list may fail under memory pressure. The loop breaks immediately, but the cancelled work is no longer pending (it would have called _cifsFileInfo_put()), and the cfile is never added to file_head for processing. The cifsFileInfo reference and the open server handle both leak. Fix by saving the cfile that failed allocation in a local variable, breaking as before, and calling _cifsFileInfo_put() on it after releasing the lock. Any files later in the iteration are unaffected since their deferred work is still pending and will fire normally.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.088800000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e3fc065682ebbbd15b0ce0036800f4acbf765d46 32390b3f06f26e366cfb27dbac4bc0196c321535 git Not specified
CNA Linux Linux affected e3fc065682ebbbd15b0ce0036800f4acbf765d46 c2f2e83e3bbc5483730fd4ee903182761f1ae50f git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c2f2e83e3bbc5483730fd4ee903182761f1ae50f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/32390b3f06f26e366cfb27dbac4bc0196c321535 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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