{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-41016",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-41016"
  ],
  "published": "2024-07-29T06:37:18Z",
  "summary": "ocfs2: strict bound check before memcmp in ocfs2_xattr_find_entry()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: strict bound check before memcmp in ocfs2_xattr_find_entry()\n\nxattr in ocfs2 maybe 'non-indexed', which saved with additional space\nrequested.  It's better to check if the memory is out of bound before\nmemcmp, although this possibility mainly comes from crafted poisonous\nimages.",
  "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-2024-41016"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e2b3d7a9d019d4d1a0da6c3ea64a1ff79c99c090"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8f9c4af7af7e9e4cd09c0251c7936593147419f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/57a3d89831fcaa2cdbe024b47c7c36d5a56c3637"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c031d286eceb82f72f8623b7f4abd2aa491bfb5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cfb926051fab19b10d1e65976211f364aa820180"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c726dea9d0c806d64c26fcef483b1fb9474d8c5e"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e4ffea01adf3323c821b6f37e9577d2d400adbaa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af77c4fc1871847b528d58b7fdafb4aa1f6a9262"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Reaching `ocfs2_xattr_find_entry()` requires a crafted OCFS2 image to be present locally (loop-mounted file or attached block device/USB stick) and then touched via `getxattr()`/`setxattr()` or an automatic security-label lookup; there is no remote protocol path into the ocfs2 xattr code.\nAC:L - The attacker authors the on-disk metadata, and `xe_name_offset` is an unvalidated `__le16`, so the read at `xs->base + name_offset` (up to 65535 bytes past a 512\u20134096 byte block buffer) fires deterministically on the first `getxattr()` with a matching type/name-length; no race, no memory-layout luck, and no non-default kernel config is involved, and for offsets inside the same page the \"out-of-bounds\" bytes are other blocks of the attacker's own image, making the `memcmp()` match reliably.\nPR:L - An unprivileged local user can supply the poisoned image (a file for loop-mount or removable media handled by udisks2/systemd automount) and then trigger the path with ordinary unprivileged `getxattr()`/`setxattr()` calls on the crafted file; no capability of the attacker's own is needed.\nUI:N - On the common desktop/kiosk/embedded deployment the attacker-supplied device is mounted automatically by the automount daemon, and the attacking process itself then issues the `getxattr()`/`setxattr()` that hits the unchecked `memcmp()` \u2014 no deliberate action by another user is required.\nS:U - The out-of-bounds read and the resulting out-of-bounds write stay inside the kernel's own memory and security authority; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - Once the unchecked `memcmp()` matches out-of-bounds bytes, `ocfs2_xattr_ibody_get()`/`ocfs2_xattr_block_get()` `memcpy()` from `xs->base + xe_name_offset + name_len` for `xe_value_size` bytes (attacker-chosen, up to XATTR_SIZE_MAX) straight into the caller's userspace buffer, disclosing kernel memory beyond the buffer_head; the match/no-match result also forms a byte-granular oracle over ~64 KiB past the buffer.\nI:H - The same missing check on the setxattr path (`ocfs2_xattr_ibody_find()`/`ocfs2_xattr_block_find()`) lets a bogus `xe_name_offset` propagate into `ocfs2_xa_set()`, where `ocfs2_xa_reuse_entry()`/`ocfs2_xa_store_value()` `memset()`/`memcpy()` attacker-supplied value bytes at `base + name_offset`, and `ocfs2_xa_block_wipe_namevalue()` `memmove()`s with that offset \u2014 an out-of-bounds heap write with controlled content suitable for control-flow hijacking.\nA:H - The read (and the subsequent write/memmove) can land up to ~65790 bytes past a 512\u20134096 byte block buffer, readily touching unmapped or unrelated memory and producing a kernel oops/page fault (immediate KASAN slab-out-of-bounds), and corrupting neighbouring kernel data crashes the system; the trigger is repeatable on demand."
    }
  }
}