netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

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Summary

CVECVE-2026-31438
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 14:16:37 UTC
Updated2026-04-23 16:17:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators When a process crashes and the kernel writes a core dump to a 9P filesystem, __kernel_write() creates an ITER_KVEC iterator. This iterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which only handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types, hitting the BUG() for any other type. Fix this by adding netfs_limit_kvec() following the same pattern as netfs_limit_bvec(), since both kvec and bvec are simple segment arrays with pointer and length fields. Dispatch it from netfs_limit_iter() when the iterator type is ITER_KVEC.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.046200000 (date 2026-04-26)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 18c2e20b42dd21db599e42d05ddaeeb647b2bb6d git Not specified
CNA Linux Linux affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 4bc2d72c7695cedf6d4e1a558924903c2b28a78e git Not specified
CNA Linux Linux affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 00d6df7115f6972370974212de9088087820802e git Not specified
CNA Linux Linux affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 67e467a11f62ff64ad219dc6aa5459e132c79d14 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.80 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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