{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64361",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64361"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "hfs/hfsplus: fix u32 overflow in check_and_correct_requested_length",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs/hfsplus: fix u32 overflow in check_and_correct_requested_length\n\ncheck_and_correct_requested_length() compares (off + len) against\nnode_size using u32 arithmetic.  When the caller passes a large len\nvalue (e.g. from an underflowed subtraction in hfs_brec_remove()),\noff + len can wrap past 2^32 and produce a small result, causing the\nbounds check to pass when it should fail.\n\nFor example, with off=14 and len=0xFFFFFFF2 (underflowed from\ndata_off - keyoffset - size in hfs_brec_remove), off + len wraps to 6,\nwhich is less than a typical node_size of 512, so the check passes and\nthe subsequent memmove reads ~4GB past the node buffer.\n\nFix this by widening the addition to u64 before comparing against\nnode_size.  This prevents the u32 wrap while keeping the logic\nstraightforward.",
  "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-2026-64361"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c8dd112173c02adf539fe2ad34a45f5e0068780d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fc9d1447ca3cdc78d2e4ace1ce1f3a7c77ca08b1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/671c3fcc2ad31c1311ea6414382a2d95104ae1b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6a481642ea1977be2f84dc08c5affd742c177e7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7399c3baee7bb622a92f0b895cd4d3009a693f2b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/607217f7ad419b53926f71e3f75001813bbc08ad"
    },
    {
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      "url": "https://git.kernel.org/stable/c/c25d3c931a63e762fcaa9cb125b901c53b62403f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/966cb76fb2857a4242cab6ea2ea17acf818a3da7"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable HFS/HFS+ B-tree operations are reachable through local filesystem syscalls such as removexattr() and rename() after a crafted volume is mounted. No network protocol directly supplies the malformed B-tree metadata.\nAC:L - A crafted B-tree deterministically produces the length underflow and u32 addition wrap; no race or condition outside the attacker's control is required.\nPR:L - Although mounting HFS/HFS+ requires init-namespace CAP_SYS_ADMIN, an unprivileged user with ordinary write access to a file on an already mounted crafted volume can trigger the flaw through user.* xattr removal or permitted rename operations.\nUI:N - The attacker can invoke the triggering filesystem syscall directly once the crafted volume is mounted; no action by another user is required.\nS:U - The corruption occurs in the kernel while processing filesystem metadata and does not cross a separate virtualization, IOMMU, or other security authority boundary.\nC:H - The wrapped near-4-GiB copy performs out-of-bounds reads and, in HFS+, can walk beyond the node's page-pointer array, providing a defensible path to broad kernel-memory disclosure.\nI:H - The affected move, copy, clear, and write paths can write beyond the B-tree node buffer; the huge memmove is therefore exploitable memory corruption rather than a read-only crash.\nA:H - The enormous out-of-bounds memory operation can reliably cause a kernel oops or panic and can corrupt large regions of kernel memory, producing complete system unavailability."
    }
  }
}