GHSA-5JWR-2VM6-6GQR
Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2025-11-04 00:30In the Linux kernel, the following vulnerability has been resolved:
mm/page_table_check: fix crash on ZONE_DEVICE
Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages().
When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device:
kernel BUG at mm/page_table_check.c:55!
While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.
{
"affected": [],
"aliases": [
"CVE-2024-40948"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-12T13:15:17Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_table_check: fix crash on ZONE_DEVICE\n\nNot all pages may apply to pgtable check. One example is ZONE_DEVICE\npages: they map PFNs directly, and they don\u0027t allocate page_ext at all\neven if there\u0027s struct page around. One may reference\ndevm_memremap_pages().\n\nWhen both ZONE_DEVICE and page-table-check enabled, then try to map some\ndax memories, one can trigger kernel bug constantly now when the kernel\nwas trying to inject some pfn maps on the dax device:\n\n kernel BUG at mm/page_table_check.c:55!\n\nWhile it\u0027s pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page\nfault resolutions, skip all the checks if page_ext doesn\u0027t even exist in\npgtable checker, which applies to ZONE_DEVICE but maybe more.",
"id": "GHSA-5jwr-2vm6-6gqr",
"modified": "2025-11-04T00:30:54Z",
"published": "2024-07-12T15:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40948"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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