NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages

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Summary

CVECVE-2026-46256
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 18:16:26 UTC
Updated2026-06-03 18:16:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages. Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context. Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 70ba381e1a431245c137ed597ec6a05991c79bd9 ae26a4cf2baf0a44c538dc093504d1994b02dade git Not specified
CNA Linux Linux affected 70ba381e1a431245c137ed597ec6a05991c79bd9 6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9 git Not specified
CNA Linux Linux affected 70ba381e1a431245c137ed597ec6a05991c79bd9 67435d2d8a33a75f9647724952cb1b18279d2e95 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/67435d2d8a33a75f9647724952cb1b18279d2e95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae26a4cf2baf0a44c538dc093504d1994b02dade 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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