{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90205",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90205"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "ocfs2: validate orphan slot during inode read",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate orphan slot during inode read\n\nPatch series \"ocfs2: validate active orphan slots during inode read\".\n\nOCFS2 trusts active ordinary and append-DIO orphan slots read from dinodes.\nA corrupted slot can therefore index osb_orphan_wipes or the slot-local\nsystem-inode cache outside their allocations before the corruption is\nreported.\n\nPatch 1 validates the ordinary orphan slot used by inode wipe processing.\nPatch 2 validates the append-DIO orphan slot used by DIO completion and\norphan recovery.  Both checks reject corrupt metadata at the existing inode\nvalidation boundary.\n\n\nThis patch (of 2):\n\n[BUG]\nA corrupted dinode with OCFS2_ORPHANED_FL can carry an\ni_orphaned_slot outside the mounted filesystem slot range.\nocfs2_wipe_inode() uses it to index osb_orphan_wipes before looking\nup the orphan directory, causing an out-of-bounds memory access.\n\nBUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\nRead of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85\nCall Trace:\n ...\n ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\n ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840\n ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]\n ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295\n evict+0x38e/0x8f0 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput fs/inode.c:1966 [inline]\n iput+0x55b/0x8b0 fs/inode.c:1926\n ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374\n ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373\n ...\n\n[CAUSE]\nocfs2_validate_inode_block() validates i_suballoc_slot but leaves\nthe active ordinary orphan slot unchecked. Downstream consumers\nassume that the value is smaller than osb->max_slots.\n\n[FIX]\nReject an active i_orphaned_slot outside the slot range during\ndinode validation, before the inode reaches orphan wipe processing.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90205"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6c908f9b4edfb04534b15573168ae038f7a9cbf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d7c4b7ce7b4baedfd8699fa692cd95f77d332de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b2d31acbd3b182755b019183fb46949ba5e39b9f"
    }
  ],
  "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 attacker-controlled field is dinode i_orphaned_slot, read from the mounted block device in ocfs2_validate_inode_block()/ocfs2_read_locked_inode() and consumed by ocfs2_wipe_inode(); it is not a field of an o2net, NFS, or SMB message. Delivery is a locally mounted OCFS2 image (loop or other block device).\nAC:L - A crafted dinode with OCFS2_ORPHANED_FL and an attacker-chosen i_orphaned_slot is accepted before the fix. ocfs2_fill_super() calls ocfs2_complete_mount_recovery(), which queues ocfs2_recover_orphans(); that igets the orphan and iputs it into ocfs2_evict_inode()\u2192ocfs2_wipe_inode() with no race.\nPR:N - ocfs2_fs_type.fs_flags has no FS_USERNS_MOUNT, so only a privileged mount(2) via ocfs2_get_tree()/ocfs2_fill_super() reaches recovery. The attacker who supplies the image needs no host credentials; unlink cannot plant this value because ocfs2_orphan_add() writes osb->slot_num.\nUI:R - The bug fires from ocfs2_complete_recovery()\u2192ocfs2_recover_orphans() after the victim mounts the crafted volume through ocfs2_fill_super(). That mount is the required user action and cannot be treated as a standing export of already-on-disk metadata.\nS:U - The out-of-bounds accesses in ocfs2_check_orphan_recovery_state() and get_local_system_inode() corrupt memory in the kernel that mounted the OCFS2 volume. No KVM, Xen, or IOMMU boundary is crossed.\nC:H - get_local_system_inode() computes index = i_orphaned_slot * NUM_LOCAL_SYSTEM_INODES and reads an 8-byte inode pointer past the kcalloc'd local_system_inodes array (KASAN UAF read in ocfs2_get_system_file_inode). A non-NULL value is passed to igrab(), disclosing adjacent slab contents.\nI:H - ocfs2_check_orphan_recovery_state() does osb->osb_orphan_wipes[slot]++ with the untrusted i_orphaned_slot against a kcalloc(max_slots) array (max_slots \u2264 255), a heap out-of-bounds increment. The OOB pointer is then used as an inode in inode_lock/ocfs2_inode_lock.\nA:H - ocfs2_node_map_test_bit() BUG()s when i_orphaned_slot >= OCFS2_NODE_MAP_MAX_NODES (256). Smaller out-of-range slots still OOB-index osb_orphan_wipes[] and local_system_inodes[], which KASAN reported as slab-use-after-free during ocfs2_recover_orphans() in ocfs2_complete_recovery()."
    }
  }
}