hfsplus: Add a sanity check for btree node size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80656
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:50 UTC
Updated2026-08-28 08:16:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: hfsplus: Add a sanity check for btree node size Syzbot reported an uninit-value bug in [1] with a corrupted HFS+ image, during the file system mounting process, specifically while loading the catalog, a corrupted node_size value of 1 caused the rec_off argument passed to hfs_bnode_read_u16() (within hfs_bnode_find()) to be excessively large. Consequently, the function failed to return a valid value to initialize the off variable, triggering the bug [1]. Every node starts from BTree node descriptor: struct hfs_bnode_desc. So, the size of node cannot be lesser than that. However, technical specification declares that: "The node size (which is expressed in bytes) must be power of two, from 512 through 32,768, inclusive." Add a check for btree node size base on technical specification. [1] BUG: KMSAN: uninit-value in hfsplus_bnode_find+0x141c/0x1600 fs/hfsplus/bnode.c:584 hfsplus_bnode_find+0x141c/0x1600 fs/hfsplus/bnode.c:584 hfsplus_btree_open+0x169a/0x1e40 fs/hfsplus/btree.c:382 hfsplus_fill_super+0x111f/0x2770 fs/hfsplus/super.c:553 get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694 get_tree_bdev+0x38/0x50 fs/super.c:1717 hfsplus_get_tree+0x35/0x40 fs/hfsplus/super.c:709 vfs_get_tree+0xb3/0x5d0 fs/super.c:1754 fc_mount fs/namespace.c:1193 [inline]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8ad2c6a36ac4328072377906a47ea0bff11e4032 306265eb9384d2c224f1b14d83a29323f0eab6d1 git Not specified
CNA Linux Linux affected 8ad2c6a36ac4328072377906a47ea0bff11e4032 3f95e2661574ff13f099dd13456751933c280628 git Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/306265eb9384d2c224f1b14d83a29323f0eab6d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f95e2661574ff13f099dd13456751933c280628 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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