{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-45999",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-45999"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()\n\nSome crafted images can have illegal (!partial_decoding &&\nm_llen < m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages < inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq->out[] access reads past the decompressed_pages\narray.\n\nHowever, such crafted cases can correctly result in a corruption\nreport in the normal LZ4 non-inplace path.\n\nLet's add an additional check to fix this for backporting.\n\nReproducible image (base64-encoded gzipped blob):\n\nH4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g\ndilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i\nPNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz\n2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w\nywAAAAAAAADwu14ATsEYtgBQAAA=\n\n$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt\n$ dd if=/mnt/data of=/dev/null bs=4096 count=1",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45999"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/778acd52e9497806fbd2cea7f770c41d6850fc48"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/118ff71ff09ebaf323a09af9e911517321a299f4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z"
  }
}