CVE-2025-38085
Estado: ModificadaMedia (4.7)—
In the Linux kernel, the following vulnerability has been resolved:
mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race
huge_pmd_unshare() drops a reference on a page table that may have previously been shared across processes, potentially turning it into a normal page table used in another process in which unrelated VMAs can afterwards be installed.
If this happens in the middle of a concurrent gup_fast(), gup_fast() could end up walking the page tables of another process. While I don't see any way in which that immediately leads to kernel memory corruption, it is really weird and unexpected.
Fix it with an explicit broadcast IPI through tlb_remove_table_sync_one(), just like we do in khugepaged when removing page tables for a THP collapse.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 4.7
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.15%
- Percentil entre todas las CVEs puntuadas: 3
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-362
Referencias
- https://git.kernel.org/stable/c/034a52b5ef57c9c8225d94e9067f3390bb33922f
- https://git.kernel.org/stable/c/1013af4f585fccc4d3e5c5824d174de2257f7d6d
- https://git.kernel.org/stable/c/952596b08c74e8fe9e2883d1dc8a8f54a37384ec
- https://git.kernel.org/stable/c/a3d864c901a300c295692d129159fc3001a56185
- https://git.kernel.org/stable/c/a6bfeb97941a9187833b526bc6cc4ff5706d0ce9
- https://git.kernel.org/stable/c/b7754d3aa7bf9f62218d096c0c8f6c13698fac8b
- https://git.kernel.org/stable/c/fe684290418ef9ef76630072086ee530b92f02b8
- https://project-zero.issues.chromium.org/issues/420715744
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race\n\nhuge_pmd_unshare() drops a reference on a page table that may have\npreviously been shared across processes, potentially turning it into a\nnormal page table used in another process in which unrelated VMAs can\nafterwards be installed.\n\nIf this happens in the middle of a concurrent gup_fast(), gup_fast() could\nend up walking the page tables of another process. While I don't see any\nway in which that immediately leads to kernel memory corruption, it is\nreally weird and unexpected.\n\nFix it with an explicit broadcast IPI through tlb_remove_table_sync_one(),\njust like we do in khugepaged when removing page tables for a THP\ncollapse."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/hugetlb: corrección de huge_pmd_unshare() frente a la competencia GUP-fast. huge_pmd_unshare() elimina una referencia en una tabla de páginas que podría haber sido compartida previamente entre procesos, lo que podría convertirla en una tabla de páginas normal utilizada por otro proceso en la que posteriormente se podrían instalar VMAs no relacionadas. Si esto ocurre durante una ejecución simultánea de gup_fast(), gup_fast() podría terminar recorriendo las tablas de páginas de otro proceso. Si bien no veo ninguna forma en que esto provoque inmediatamente una corrupción de memoria en el kernel, es realmente extraño e inesperado. Corríjalo con una IPI de difusión explícita a través de tlb_remove_table_sync_one(), tal como hacemos en khugepaged al eliminar tablas de páginas durante un colapso de THP."
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