GHSA-X3QV-W3HG-XGC7
Vulnerability from github – Published: 2026-08-19 06:31 – Updated: 2026-08-20 21:31When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager's page list. A subsequent page fault will cause the fault handler to re-insert the page into the object's list. This corrupts the list, and on object destruction the page is freed twice.
An unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects ("fictitious pages") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.
{
"affected": [],
"aliases": [
"CVE-2026-49418"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-19T05:17:03Z",
"severity": "HIGH"
},
"details": "When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager\u0027s page list. A subsequent page fault will cause the fault handler to re-insert the page into the object\u0027s list. This corrupts the list, and on object destruction the page is freed twice.\n\nAn unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (\"fictitious pages\") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.",
"id": "GHSA-x3qv-w3hg-xgc7",
"modified": "2026-08-20T21:31:22Z",
"published": "2026-08-19T06:31:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49418"
},
{
"type": "WEB",
"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.asc"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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