nfs: return EISDIR on nfs3_proc_create if d_alias is a dir

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Summary

CVECVE-2026-43470
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:17:00 UTC
Updated2026-05-08 15:17:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfs: return EISDIR on nfs3_proc_create if d_alias is a dir If we found an alias through nfs3_do_create/nfs_add_or_obtain /d_splice_alias which happens to be a dir dentry, we don't return any error, and simply forget about this alias, but the original dentry we were adding and passed as parameter remains negative. This later causes an oops on nfs_atomic_open_v23/finish_open since we supply a negative dentry to do_dentry_open. This has been observed running lustre-racer, where dirs and files are created/removed concurrently with the same name and O_EXCL is not used to open files (frequent file redirection). While d_splice_alias typically returns a directory alias or NULL, we explicitly check d_is_dir() to ensure that we don't attempt to perform file operations (like finish_open) on a directory inode, which triggers the observed oops.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.047280000 (date 2026-05-11)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7c6c5249f061b64fc6b5b90bc147169a048691bf 7e2963773760a664684435201960dd2fb712f1b5 git Not specified
CNA Linux Linux affected 7c6c5249f061b64fc6b5b90bc147169a048691bf 203c792cb4315360d49973ae2e57feeb6d3dcf7e git Not specified
CNA Linux Linux affected 7c6c5249f061b64fc6b5b90bc147169a048691bf 9ee1770fcb2f1b48354622b926e7dc10222805f5 git Not specified
CNA Linux Linux affected 7c6c5249f061b64fc6b5b90bc147169a048691bf 410666a298c34ebd57256fde6b24c96bd23059a2 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.19 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7e2963773760a664684435201960dd2fb712f1b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/203c792cb4315360d49973ae2e57feeb6d3dcf7e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ee1770fcb2f1b48354622b926e7dc10222805f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/410666a298c34ebd57256fde6b24c96bd23059a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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