{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90321",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90321"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "ocfs2: validate inline xattrs during inode block validation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate inline xattrs during inode block validation\n\nPatch series \"ocfs2: validate xattr entry bounds\", v7.\n\nThis series validates OCFS2 xattr entry name/value bounds when xattr\nmetadata is read and validated, before getxattr() or listxattr() can walk\nout-of-range entry arrays or offsets from corrupted metadata.\n\n\nThis patch (of 2):\n\nocfs2_validate_inode_block() verifies a dinode before OCFS2 users walk\nmetadata from it, but inline xattr metadata is still checked only in\noperation-specific consumers.  The existing ibody lookup helper validates\ninline header placement and entry count, but inode block validation does\nnot reject entry name/value bounds.\n\nAdd a flat xattr entry validator and call it from inode block validation\nfor inline xattrs.  Keep the operation paths on their existing\nheader/count lookup checks; the full entry bounds check now runs when the\ninode block is validated at read time.\n\nReject corrupted inline xattr metadata before ocfs2_xattr_ibody_get() or\nlistxattr() can walk past the inline storage.\n\nValidation reproduced this kernel report:\nBUG: KASAN: use-after-free in ocfs2_xattr_find_entry+0x5a/0x170\nRead of size 2 at addr ffff8881242a2000 by task python3/529\nCall Trace:\n  dump_stack_lvl+0x66/0xa0\n  print_report+0xce/0x630\n  kasan_report+0xe0/0x110\n  ocfs2_xattr_find_entry+0x5a/0x170\n  ocfs2_xattr_get_nolock+0x20a/0x820\n  ocfs2_xattr_get+0x10c/0x1e0\n  __vfs_getxattr+0xe2/0x130\n  vfs_getxattr+0x185/0x1b0",
  "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-2026-90321"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3fd45b24879fa4885b66a582a6e47eda67f11310"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8914a3330b72378136c2c02d6328a826f6abdad7"
    }
  ],
  "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 bytes are dinode inline-xattr xe_name_offset, xe_name_len and xe_value_size, read from the inode block by ocfs2_read_inode_block() into ocfs2_validate_inode_block() and later walked by ocfs2_xattr_ibody_get()/ocfs2_xattr_ibody_list(); no o2net, NFS, or SMB message carries those offsets.\nAC:L - A crafted dinode with OCFS2_INLINE_XATTR_FL and attacker-chosen xe_name_offset/xe_value_size is sufficient; after mount, getxattr(2) reaches vfs_getxattr()\u2192ocfs2_xattr_get()\u2192ocfs2_xattr_find_entry() and hits the reported KASAN UAF with no race or other condition outside the attacker\u2019s control.\nPR:N - ocfs2_fs_type.fs_flags has no FS_USERNS_MOUNT, so the attacker cannot self-mount; ocfs2_xa_set() writes well-formed inline entries, so planting a bad xe_name_offset needs a crafted image. After the victim\u2019s ocfs2_fill_super(), listxattr(2) calls ocfs2_listxattr() with no MAY_READ/DAC check.\nUI:R - The inline xattr payload is inert until a victim mounts the crafted OCFS2 image through ocfs2_fill_super(); getxattr(2) or listxattr(2) on that volume is the follow-on action that reaches ocfs2_xattr_find_entry() or ocfs2_xattr_list_entries().\nS:U - The OOB/UAF is in the dinode buffer_head parsed by ocfs2_validate_inode_block() on the same host that mounted the volume and does not cross a VM, IOMMU, or guest-to-host boundary.\nC:H - ocfs2_xattr_list_entries() memcpy\u2019s xe_name_len bytes from header+xe_name_offset into the listxattr buffer, and ocfs2_xattr_ibody_get() memcpy\u2019s xe_value_size bytes from that same unvalidated offset into the getxattr buffer; the repro is a KASAN UAF read of size 2 in ocfs2_xattr_find_entry().\nI:H - The same unvalidated xe_name_offset/xe_value_size are a kernel UAF/OOB walk of the inline region; ocfs2_xa_block_wipe_namevalue() memmove\u2019s from header+min(xe_name_offset) with namevalue_size_xe() taken from on-disk xe_value_size when setxattr reuses that entry, a heap write primitive.\nA:H - The KASAN report is a use-after-free in ocfs2_xattr_find_entry() from getxattr; namevalue_size_xe() BUG_ON()s when a local inline entry has xe_value_size > OCFS2_XATTR_INLINE_SIZE, and walking an out-of-range name/value offset can oops the node."
    }
  }
}