{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93095",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93095"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "hfsplus: validate thread record before delete key rebuild",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfsplus: validate thread record before delete key rebuild\n\nhfsplus_delete_cat() is called with str == NULL when the last open\nreference to an unlinked HFS+ hardlink backing inode is closed. In that\ncase, the function finds the catalog thread by CNID and rebuilds the\ncatalog key from thread.nodeName.\n\nThat reconstruction path reads thread.nodeName.length directly from the\ncatalog B-tree into fd.search_key and then copies length * 2 bytes into\nfd.search_key->cat.name.unicode. It does not first check that the found\nrecord is a thread record or that its size matches the thread name.\n\nA corrupted image can therefore provide an oversized thread name length\nand make hfs_bnode_read() write past the catalog search-key allocation.\n\nRead the CNID record through hfsplus_brec_read_cat(), which bounds the\nrecord read to sizeof(hfsplus_cat_entry) and verifies that a thread\nrecord's size exactly matches nodeName.length. Together, these checks\nensure an accepted thread name fits HFSPLUS_MAX_STRLEN. Reject non-thread\nrecords before building the delete key from the validated thread name.\n\nShare the thread-record-type helper between hfsplus_find_cat() and\nhfsplus_delete_cat().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93095"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/33cda0036bc683fc888c20b04a5fc030e3e8413b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b9729c51a8b67f8b20b8a8cf395da4be63a0c15b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af48abc1b00d865c3f4c4d76b901c44115cb7162"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e20f3b749ad241df77ec1c3e13a9c22209aa1eb3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7898beee166c1145c0bca364d687b8437435bf1a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e31985c67ba00a59d9b1340af473c1dbe6c87856"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/473ea7aa35615829f0de7a71e8691d69dc24e328"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e2ea5cac61acfc11dad22f1d2d4bc71d56c52a20"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The malformed value is on-disk catalog thread.nodeName.length. unlink(2) reaches it via do_unlinkat \u2192 vfs_unlink \u2192 hfsplus_unlink, and close via hfsplus_file_release; both call hfsplus_delete_cat() with str==NULL so hfs_bnode_read() copies that length into fd.search_key. This is local block/loop/USB VFS data, not a ksmbd/nfsd/packet field.\nAC:L - A crafted HFS+ catalog thread with nodeName.length above HFSPLUS_MAX_STRLEN (255) makes hfs_bnode_read() write length*2 bytes into fd.search_key->cat.name.unicode, which hfs_find_init() allocated as only cat_tree->max_key_len*2+4 bytes (~1036). The overflow is deterministic on unlink/close of that hardlink backing inode; no race or uninfluenced layout is required.\nPR:L - hfsplus_fs_type is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so raw mount(2) needs CAP_SYS_ADMIN, but the highest-impact case is an unprivileged user whose USB/loop HFS+ image is mounted by udisks2/polkit or a desktop automounter. After mount, may_delete_dentry only requires MAY_WRITE|MAY_EXEC on the attacker-owned directory.\nUI:N - The attacker supplies the crafted volume and then issues unlink(2) or close on the hardlink themselves. Automount of that local/removable image is not a separate victim action once the vector is Local.\nS:U - The hfs_find_init() kmalloc overflow and any resulting kernel memory corruption stay inside the host kernel that is parsing the HFS+ catalog B-tree. No KVM/Xen guest-to-host, IOMMU, or sandbox boundary is crossed.\nC:H - hfs_bnode_read() copies attacker-chosen catalog bytes past the search-key object into adjacent heap. That out-of-bounds write is a memory-corruption primitive that can be leveraged for arbitrary kernel-memory disclosure.\nI:H - The same unbounded write from hfs_bnode_read() into the hfs_find_init() search-key allocation overwrites neighboring slab objects, which is sufficient for an arbitrary kernel write and control-flow hijacking.\nA:H - Writing past the ~1036-byte search-key object oopses or panics the kernel (slab-out-of-bounds or GP fault) while cat_tree->tree_lock is held, crashing the machine or wedging further HFS+ operations."
    }
  }
}