{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In 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]",
  "id": "DEBIAN-CVE-2026-80656",
  "modified": "2026-09-14T16:47:43.667710211Z",
  "published": "2026-08-28T08:16:50.700Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80656"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-80656"
  ]
}