{"id":"CVE-2026-80656","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: Add a sanity check for btree node size\n\nSyzbot reported an uninit-value bug in [1] with a corrupted HFS+ image,\nduring the file system mounting process, specif…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: Add a sanity check for btree node size\n\nSyzbot reported an uninit-value bug in [1] with a corrupted HFS+ image,\nduring the file system mounting process, specif…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","published":"2026-08-28","updated":"2026-08-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80656","references":[{"url":"https://git.kernel.org/stable/c/306265eb9384d2c224f1b14d83a29323f0eab6d1","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3f95e2661574ff13f099dd13456751933c280628","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd"],"epss":0.0012,"epssPercentile":0.02117,"ingestedAt":"2026-08-30T03:46:31.385Z","slug":"CVE-2026-80656","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: Add a sanity check for btree node size\n\nSyzbot reported an uninit-value bug in [1] with a corrupted HFS+ image,\nduring the file system mounting process, specifically while loading the\ncatalog, a corrupted node_size value of 1 caused the rec_off argument\npassed to hfs_bnode_read_u16() (within hfs_bnode_find()) to be excessively\nlarge. Consequently, the function failed to return a valid value to\ninitialize the off variable, triggering the bug [1].\n\nEvery node starts from BTree node descriptor: struct hfs_bnode_desc.\nSo, the size of node cannot be lesser than that. However, technical\nspecification declares that: \"The node size (which is expressed in bytes)\nmust be power of two, from 512 through 32,768, inclusive.\" Add a check\nfor btree node size base on technical specification.\n\n[1]\nBUG: KMSAN: uninit-value in hfsplus_bnode_find+0x141c/0x1600 fs/hfsplus/bnode.c:584\n hfsplus_bnode_find+0x141c/0x1600 fs/hfsplus/bnode.c:584\n hfsplus_btree_open+0x169a/0x1e40 fs/hfsplus/btree.c:382\n hfsplus_fill_super+0x111f/0x2770 fs/hfsplus/super.c:553\n get_tree_bdev_flags+0x6e6/0x920 fs/super.c:1694\n get_tree_bdev+0x38/0x50 fs/super.c:1717\n hfsplus_get_tree+0x35/0x40 fs/hfsplus/super.c:709\n vfs_get_tree+0xb3/0x5d0 fs/super.c:1754\n fc_mount fs/namespace.c:1193 [inline]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}