GHSA-9F7M-PC72-73FJ
Vulnerability from github – Published: 2025-12-04 18:30 – Updated: 2026-07-30 06:32In the Linux kernel, the following vulnerability has been resolved:
erofs: fix crafted invalid cases for encoded extents
Robert recently reported two corrupted images that can cause system crashes, which are related to the new encoded extents introduced in Linux 6.15:
-
The first one [1] has plen != 0 (e.g. plen == 0x2000000) but (plen & Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent special extents such as sparse extents (!EROFS_MAP_MAPPED), but previously only plen == 0 was handled;
-
The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000, then "cur [0xfffffffffffff000] += bvec.bv_len [0x1000]" in "} while ((cur += bvec.bv_len) < end);" wraps around, causing an out-of-bound access of pcl->compressed_bvecs[] in z_erofs_submit_queue(). EROFS only supports 48-bit physical block addresses (up to 1EiB for 4k blocks), so add a sanity check to enforce this.
{
"affected": [],
"aliases": [
"CVE-2025-40241"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-04T16:16:17Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix crafted invalid cases for encoded extents\n\nRobert recently reported two corrupted images that can cause system\ncrashes, which are related to the new encoded extents introduced\nin Linux 6.15:\n\n - The first one [1] has plen != 0 (e.g. plen == 0x2000000) but\n (plen \u0026 Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent\n special extents such as sparse extents (!EROFS_MAP_MAPPED), but\n previously only plen == 0 was handled;\n\n - The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000,\n then \"cur [0xfffffffffffff000] += bvec.bv_len [0x1000]\" in\n \"} while ((cur += bvec.bv_len) \u003c end);\" wraps around, causing an\n out-of-bound access of pcl-\u003ecompressed_bvecs[] in\n z_erofs_submit_queue(). EROFS only supports 48-bit physical block\n addresses (up to 1EiB for 4k blocks), so add a sanity check to\n enforce this.",
"id": "GHSA-9f7m-pc72-73fj",
"modified": "2026-07-30T06:32:17Z",
"published": "2025-12-04T18:30:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40241"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/00d8fe0b72f4ca0a983abced36aad2160038c421"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a429b76114aaca3ef1aff4cd469dcf025431bd11"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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