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Description

In 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").

PUBLISHED Reserved 2026-05-13 | Published 2026-06-03 | Updated 2026-06-03 | Assigner Linux

Product status

Default status
unaffected

70ba381e1a431245c137ed597ec6a05991c79bd9 (git) before ae26a4cf2baf0a44c538dc093504d1994b02dade
affected

70ba381e1a431245c137ed597ec6a05991c79bd9 (git) before 6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9
affected

70ba381e1a431245c137ed597ec6a05991c79bd9 (git) before 67435d2d8a33a75f9647724952cb1b18279d2e95
affected

Default status
affected

6.12
affected

Any version before 6.12
unaffected

6.18.14 (semver)
unaffected

6.19.4 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/ae26a4cf2baf0a44c538dc093504d1994b02dade

git.kernel.org/...c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9

git.kernel.org/...c/67435d2d8a33a75f9647724952cb1b18279d2e95

cve.org (CVE-2026-46256)

nvd.nist.gov (CVE-2026-46256)

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