CVE-2026-49418
Full vulnerability record from the local CVENow database.
Description
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'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.
Severity
HIGH
CVSS score
8.8
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-08-19 05:17:03.943000
Last modified
2026-11-05 21:10:00.183000
View original CVE JSON
{
"id": "CVE-2026-49418",
"sourceIdentifier": "[email protected]",
"published": "2026-08-19T05:17:03.943",
"lastModified": "2026-11-05T21:10:00.183",
"vulnStatus": "Analyzed",
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"lang": "en",
"value": "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'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.\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."
},
{
"lang": "es",
"value": "Cuando se llama a msync(MS_INVALIDATE) en una asignación de un objeto de dispositivo no gestionado, las páginas físicas en el rango de asignación se marcan como inválidas pero permanecen en la lista de páginas del paginador. Una posterior falla de página hará que el gestor de fallas reinserte la página en la lista del objeto. Esto corrompe la lista, y en la destrucción del objeto la página se libera dos veces.\n\nUn usuario local sin privilegios con acceso a un dispositivo que proporciona E/S mapeada en memoria puede desencadenar un uso después de liberación en el kernel, aunque esto se limita a un grupo de objetos (páginas ficticias) que nunca se reciclan para un propósito diferente. Puede ser posible explotar esto para escalar privilegios."
}
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"affected": [
{
"source": "[email protected]",
"affectedData": [
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"product": "FreeBSD",
"defaultStatus": "unknown",
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"attackComplexity": "LOW",
"privilegesRequired": "LOW",
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"references": [
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"url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.asc",
"source": "[email protected]",
"tags": [
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}