{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64322",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64322"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "udf: validate sparing table length as an entry count, not a byte count",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate sparing table length as an entry count, not a byte count\n\nudf_load_sparable_map() accepts a sparing table when\n\n\tsizeof(*st) + le16_to_cpu(st->reallocationTableLen) > sb->s_blocksize\n\nis false, i.e. it treats reallocationTableLen as a number of BYTES that\nmust fit in the block.  But the table is walked as an array of 8-byte\nsparingEntry elements:\n\n\tfor (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = &st->mapEntry[i];\n\t\t... entry->origLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks().  A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N <= blocksize, yet the consumers index\nsizeof(*st) + N * sizeof(struct sparingEntry) bytes -- up to ~8x the\nblock.  On a crafted UDF image this is an out-of-bounds read in\nudf_get_pblock_spar15(); udf_relocate_blocks() additionally feeds the\nsame length to udf_update_tag(), whose crc_itu_t() reads far past the\nblock, and its memmove() through st->mapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size().",
  "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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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093"
    }
  ],
  "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 - A crafted UDF image must be presented and mounted as local loop or removable block media; no network-facing path reaches this parser.\nAC:L - The attacker deterministically controls the entry count, table contents, block size, and accessed packet, with no race or condition outside attacker control.\nPR:L - Direct mounting requires initial-namespace CAP_SYS_ADMIN and user namespaces do not help, but common UDisks/polkit configurations let an active unprivileged local user mount attacker-controlled loop or removable media through a privileged broker.\nUI:N - The local attacker can request the brokered mount and trigger block translation themselves, requiring no action by a separate victim.\nS:U - Exploitation compromises the host kernel within its existing security authority and does not inherently cross a VM, IOMMU, or other scope boundary.\nC:H - The malformed count permits reads up to roughly eight times beyond the block, and relocation can expose adjacent kernel data through copied entries or returned mapping values.\nI:H - udf_relocate_blocks performs an out-of-bounds origLocation store and attacker-sized memmove through mapEntry[], potentially corrupting adjacent kernel pages and enabling control-flow hijacking.\nA:H - The extensive out-of-bounds reads and writes can reliably cause a kernel oops, panic, or fatal memory corruption."
    }
  }
}