{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "598162d050801e556750defff4ddab499e5d76ed"
            },
            {
              "fixed": "778acd52e9497806fbd2cea7f770c41d6850fc48"
            },
            {
              "fixed": "118ff71ff09ebaf323a09af9e911517321a299f4"
            },
            {
              "fixed": "43a878639b90e9721ffa5eb616a7e6d8454adef3"
            },
            {
              "fixed": "f1374fa6e57fd836623668d782ded9244cfd2938"
            },
            {
              "fixed": "c9ce18e6bb2c467ec85756dc7989b547b7584fee"
            },
            {
              "fixed": "bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
            },
            {
              "fixed": "21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.13.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.88"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.30"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45999.json"
  },
  "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 \u0026\u0026\nm_llen \u003c m_plen) extents, and the LZ4 inplace decompression path\ncan be wrongly hit, but it cannot handle (outpages \u003c inpages)\nproperly: \"outpages - inpages\" wraps to a large value and\nthe subsequent rq-\u003eout[] 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",
  "id": "CVE-2026-45999",
  "modified": "2026-07-15T01:49:18.215313029Z",
  "published": "2026-05-27T12:55:53.846Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/118ff71ff09ebaf323a09af9e911517321a299f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/778acd52e9497806fbd2cea7f770c41d6850fc48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45999.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45999"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()"
}