CVE-2026-46268
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
PCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition
Commit b7e282378773 has already changed the initial page refcount of p2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses "VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))" to assert the initial page refcount should not be zero and the following will be reported when CONFIG_DEBUG_VM is enabled:
Fix by using "page_ref_count(page)" as the assertion condition.
Detalles técnicos trazas, registros y código del informe original
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000 flags: 0x20000000002000(reserved|node=0|zone=4) raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page)) ------------[ cut here ]------------ WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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 (1)
CWE
- NVD-CWE-noinfo
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/P2PDMA: Fix p2pmem_alloc_mmap() warning condition\n\nCommit b7e282378773 has already changed the initial page refcount of\np2pdma page from one to zero, however, in p2pmem_alloc_mmap() it uses\n\"VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\" to assert the initial page\nrefcount should not be zero and the following will be reported when\nCONFIG_DEBUG_VM is enabled:\n\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000\n flags: 0x20000000002000(reserved|node=0|zone=4)\n raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\n ------------[ cut here ]------------\n WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60\n\nFix by using \"page_ref_count(page)\" as the assertion condition."
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nPCI/P2PDMA: Solución a la condición de advertencia de p2pmem_alloc_mmap()\n\nEl commit b7e282378773 ya ha cambiado el recuento de referencias de página inicial de la página p2pdma de uno a cero; sin embargo, en p2pmem_alloc_mmap() utiliza 'VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))' para afirmar que el recuento de referencias de página inicial no debe ser cero y se informará lo siguiente cuando CONFIG_DEBUG_VM esté habilitado:\n\n page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x380400000\n flags: 0x20000000002000(reserved|node=0|zone=4)\n raw: 0020000000002000 ff1100015e3ab440 0000000000000000 0000000000000000\n raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000\n page dumped because: VM_WARN_ON_ONCE_PAGE(!page_ref_count(page))\n ------------[ cut here ]------------\n WARNING: CPU: 5 PID: 449 at drivers/pci/p2pdma.c:240 p2pmem_alloc_mmap+0x83a/0xa60\n\nSe corrige utilizando 'page_ref_count(page)' como condición de aserción."
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"lastModified": "2026-07-22T20:10:00.127",
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