{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47670",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-47670"
  ],
  "published": "2024-10-09T14:49:30Z",
  "summary": "ocfs2: add bounds checking to ocfs2_xattr_find_entry()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: add bounds checking to ocfs2_xattr_find_entry()\n\nAdd a paranoia check to make sure it doesn't stray beyond valid memory\nregion containing ocfs2 xattr entries when scanning for a match.  It will\nprevent out-of-bound access in case of crafted images.",
  "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-2024-47670"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b49a786beb11ff740cb9e0c20b999c2a0e1729c2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60c0d36189bad58b1a8e69af8781d90009559ea1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/34759b7e4493d7337cbc414c132cef378c492a2c"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5bbe51eaf01a5dd6fb3f0dea81791e5dbc6dc6dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b32539590a8e6400ac2f6e7cf9cbb8e08711a2f"
    },
    {
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      "url": "https://git.kernel.org/stable/c/1f6e167d6753fe3ea493cdc7f7de8d03147a4d39"
    },
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      "url": "https://git.kernel.org/stable/c/8e7bef408261746c160853fc27df3139659f5f77"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e3041fecdc8f78a5900c3aa51d3d756e73264d6"
    }
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  "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 - Exploitation requires a crafted OCFS2 filesystem image to be present on the local system (loop-mounted image file or attached block device/USB stick) and then accessed; there is no remote network path to `ocfs2_xattr_find_entry()`. Local access via mount + normal file access syscalls is the vector.\nAC:L - The attacker fully authors the on-disk metadata \u2014 `xh_count` is an unvalidated `__le16` and metadata ECC/signature checks are trivially satisfied when crafting the image \u2014 so the out-of-bounds walk fires deterministically on the first ACL lookup or getxattr. No race, no memory-layout luck, and no non-default kernel configuration is needed.\nPR:L - An unprivileged local user can supply the malicious image (drop a file for loop-mount, or attach removable media handled by udisks2/systemd automount); the attacker needs no elevated privileges of their own, and once mounted, the triggering ACL path is reached by ordinary unprivileged file access such as `ls -l`.\nUI:N - On the common desktop/kiosk/embedded deployment the image is mounted automatically by the automount daemon when the attacker-supplied device appears, and the vulnerable path is then entered by routine filesystem indexing/ACL lookups with no deliberate victim action required.\nS:U - The out-of-bounds read and write stay within the kernel's own memory and security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - When the unbounded scan matches an entry in out-of-bounds memory, `ocfs2_xattr_ibody_get()` reads `xe_value_size` and `xe_name_offset` from that OOB entry and `memcpy()`s kernel heap contents straight into the caller's `getxattr()` buffer, yielding a large (up to XATTR_SIZE_MAX) kernel memory disclosure to userspace.\nI:H - The corrupted out-of-bounds `xs->here` pointer is propagated to `ocfs2_init_dinode_xa_loc()`/`ocfs2_xa_set()` on the setxattr path (`fs/ocfs2/xattr.c:2794`), producing an out-of-bounds write with attacker-influenced content past the buffer_head data \u2014 a heap corruption primitive suitable for control-flow hijacking.\nA:H - The loop can stride up to 65535 \u00d7 16 bytes (~1 MiB) beyond a 512\u20134096 byte block buffer, so it will readily dereference unmapped memory and take a kernel page fault/oops (immediate slab-out-of-bounds under KASAN), crashing the system."
    }
  }
}