{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-45999",
  "modified": "2026-10-09T11:39:44Z",
  "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",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H"
    }
  ],
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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",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - EROFS is mounted from a local block device/image file (FS_REQUIRES_DEV, not userns-mountable); triggering requires locally providing a crafted image and reading from it, with no network path.\nAC:L - The attacker fully controls the crafted image (a working base64 reproducer is in the commit); the illegal extent reliably forces outpages<inpages and the underflow on the first read with no race or uncontrolled condition.\nPR:N - Crafting the malicious image requires no privileges or account on the target system; the attacker merely supplies the image, consistent with the analogous crafted-image CVE-2026-43166 (PR:N).\nUI:R - A victim or automount service must mount the attacker-supplied EROFS image and access the file for the decompression path to be reached.\nS:U - The OOB access and resulting crash stay within the kernel's own security authority; no VM/IOMMU/sandbox boundary is crossed.\nC:H - The unsigned underflow produces an unbounded out-of-bounds read of the page-pointer array far past its end, and in the matching path wild kernel memory can be fed into the decompressed output read by userspace \u2014 per kernel guidance an unbounded OOB read is High.\nI:N - The flaw is strictly a read underflow (\"reads past the decompressed_pages array\"); it yields no out-of-bounds write or control-flow primitive, matching the analogous OOB-read CVE-2026-43166 (I:N).\nA:H - Indexing the array ~32 GB beyond its base dereferences unmapped kernel memory, reliably causing a kernel oops/panic and denial of service."
    }
  }
}