nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89723
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:01 UTC
Updated2026-09-11 20:20:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 36a580eb489f54d81a0534974962e732a314b999 5d3783c451a546373662ee11ec17019273e68034 git Not specified
CNA Linux Linux affected 36a580eb489f54d81a0534974962e732a314b999 448636c745a3f3b8582a0b8ce718c890a11c0fa9 git Not specified
CNA Linux Linux affected 36a580eb489f54d81a0534974962e732a314b999 28362e8ce51377afdec1782e661e808328a10514 git Not specified
CNA Linux Linux affected 36a580eb489f54d81a0534974962e732a314b999 45662dedb8f272ef7f16e69f13424c4bd0399240 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/45662dedb8f272ef7f16e69f13424c4bd0399240 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d3783c451a546373662ee11ec17019273e68034 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/448636c745a3f3b8582a0b8ce718c890a11c0fa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/28362e8ce51377afdec1782e661e808328a10514 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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