{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43075",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43075"
  ],
  "published": "2026-05-06T07:41:37Z",
  "summary": "ocfs2: fix out-of-bounds write in ocfs2_write_end_inline",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix out-of-bounds write in ocfs2_write_end_inline\n\nKASAN reports a use-after-free write of 4086 bytes in\nocfs2_write_end_inline, called from ocfs2_write_end_nolock during a\ncopy_file_range splice fallback on a corrupted ocfs2 filesystem mounted on\na loop device.  The actual bug is an out-of-bounds write past the inode\nblock buffer, not a true use-after-free.  The write overflows into an\nadjacent freed page, which KASAN reports as UAF.\n\nThe root cause is that ocfs2_try_to_write_inline_data trusts the on-disk\nid_count field to determine whether a write fits in inline data.  On a\ncorrupted filesystem, id_count can exceed the physical maximum inline data\ncapacity, causing writes to overflow the inode block buffer.\n\nCall trace (crash path):\n\n   vfs_copy_file_range (fs/read_write.c:1634)\n     do_splice_direct\n       splice_direct_to_actor\n         iter_file_splice_write\n           ocfs2_file_write_iter\n             generic_perform_write\n               ocfs2_write_end\n                 ocfs2_write_end_nolock (fs/ocfs2/aops.c:1949)\n                   ocfs2_write_end_inline (fs/ocfs2/aops.c:1915)\n                     memcpy_from_folio     <-- KASAN: write OOB\n\nSo add id_count upper bound check in ocfs2_validate_inode_block() to\nalongside the existing i_size check to fix it.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43075"
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      "scenario": "AV:L - The vulnerable OCFS2 inline write path is reached through local VFS operations such as write/copy_file_range on an OCFS2 file, not by packets or physical device parsing directly.\nAC:L - Once a malformed inline-data inode with an excessive id_count is present, triggering the overflow is deterministic through ordinary writes and does not require winning a race or relying on conditions outside attacker control.\nPR:L - The write path itself has no OCFS2-specific privileged gate beyond normal file write permission, so a local user able to write the affected mounted file can trigger it. OCFS2 is not userns-mountable and crafting/mounting the corrupted image normally needs admin rights, but the highest reasonable shared-mounted-filesystem trigger requires only low local privileges.\nUI:N - After the affected OCFS2 filesystem is mounted, exploitation is triggered by the attacker's own file operation and does not require another user to act.\nS:U - The corruption occurs within kernel filesystem/buffer-cache memory and does not cross a separate security authority such as a guest/host or IOMMU boundary.\nC:H - This is attacker-controlled out-of-bounds kernel memory corruption, which can reasonably be leveraged into disclosure primitives rather than only a visible crash.\nI:H - The bug performs an out-of-bounds write from attacker-controlled file data past the inode block buffer, making high-integrity impact appropriate.\nA:H - The reported KASAN crash and the underlying kernel memory corruption can oops or panic the kernel, producing high availability impact."
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}