GHSA-XQMQ-2P4J-99X8
Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-06-19 15:33In the Linux kernel, the following vulnerability has been resolved:
erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()
Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array.
However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path.
Let's add an additional check to fix this for backporting.
Reproducible image (base64-encoded gzipped blob):
H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA=
$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1
{
"affected": [],
"aliases": [
"CVE-2026-45999"
],
"database_specific": {
"cwe_ids": [
"CWE-191"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T14:17:17Z",
"severity": "HIGH"
},
"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\u0027s 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": "GHSA-xqmq-2p4j-99x8",
"modified": "2026-06-19T15:33:12Z",
"published": "2026-05-27T15:33:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45999"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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