cve-2021-46967
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2024-08-04 05:17
Severity
Summary
vhost-vdpa: fix vm_flags for virtqueue doorbell mapping
References
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-46967\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:07.170\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvhost-vdpa: fix vm_flags for virtqueue doorbell mapping\\n\\nThe virtqueue doorbell is usually implemented via registeres but we\\ndon\u0027t provide the necessary vma-\u003eflags like VM_PFNMAP. This may cause\\nseveral issues e.g when userspace tries to map the doorbell via vhost\\nIOTLB, kernel may panic due to the page is not backed by page\\nstructure. This patch fixes this by setting the necessary\\nvm_flags. With this patch, try to map doorbell via IOTLB will fail\\nwith bad address.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: vhost-vdpa: corrige vm_flags para el mapeo del timbre virtqueue El timbre virtqueue generalmente se implementa a trav\u00e9s de registros, pero no proporcionamos los vma-\u0026gt;flags necesarios como VM_PFNMAP. Esto puede causar varios problemas, por ejemplo, cuando el espacio de usuario intenta asignar el timbre a trav\u00e9s de vhost IOTLB, el kernel puede entrar en p\u00e1nico debido a que la p\u00e1gina no est\u00e1 respaldada por la estructura de la p\u00e1gina. Este parche soluciona este problema configurando los vm_flags necesarios. Con este parche, intentar asignar el timbre a trav\u00e9s de IOTLB fallar\u00e1 con una direcci\u00f3n incorrecta.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a3e0fad16d40a2aa68ddf7eea4acdf48b22dd44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b8b6399666a29daa30b0bb3f5c9e3fc81c5a6a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93dbbf20e3ffad14f04227a0b7105f6e6f0387ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/940230a5c31e2714722aee04c521a21f484b4df7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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