GHSA-6CV4-FCR9-FCMW
Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-11-10 21:30In the Linux kernel, the following vulnerability has been resolved:
hugetlbfs: don't delete error page from pagecache
This change is very similar to the change that was made for shmem [1], and it solves the same problem but for HugeTLBFS instead.
Currently, when poison is found in a HugeTLB page, the page is removed from the page cache. That means that attempting to map or read that hugepage in the future will result in a new hugepage being allocated instead of notifying the user that the page was poisoned. As [1] states, this is effectively memory corruption.
The fix is to leave the page in the page cache. If the user attempts to use a poisoned HugeTLB page with a syscall, the syscall will fail with EIO, the same error code that shmem uses. For attempts to map the page, the thread will get a BUS_MCEERR_AR SIGBUS.
[1]: commit a76054266661 ("mm: shmem: don't truncate page if memory failure happens")
{
"affected": [],
"aliases": [
"CVE-2022-49828"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T15:16:06Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhugetlbfs: don\u0027t delete error page from pagecache\n\nThis change is very similar to the change that was made for shmem [1], and\nit solves the same problem but for HugeTLBFS instead.\n\nCurrently, when poison is found in a HugeTLB page, the page is removed\nfrom the page cache. That means that attempting to map or read that\nhugepage in the future will result in a new hugepage being allocated\ninstead of notifying the user that the page was poisoned. As [1] states,\nthis is effectively memory corruption.\n\nThe fix is to leave the page in the page cache. If the user attempts to\nuse a poisoned HugeTLB page with a syscall, the syscall will fail with\nEIO, the same error code that shmem uses. For attempts to map the page,\nthe thread will get a BUS_MCEERR_AR SIGBUS.\n\n[1]: commit a76054266661 (\"mm: shmem: don\u0027t truncate page if memory failure happens\")",
"id": "GHSA-6cv4-fcr9-fcmw",
"modified": "2025-11-10T21:30:28Z",
"published": "2025-05-01T15:31:49Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49828"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/30571f28bb35c826219971c63bcf60d2517112ed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8625147cafaa9ba74713d682f5185eb62cb2aedb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ec667443b2dbc6cdbbac4073e51a17733158ec6a"
}
],
"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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