Vulnerability CVE-2024-36953
Published: 2024-05-30

Description:
In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic-v2: Check for non-NULL vCPU in vgic_v2_parse_attr()

vgic_v2_parse_attr() is responsible for finding the vCPU that matches
the user-provided CPUID, which (of course) may not be valid. If the ID
is invalid, kvm_get_vcpu_by_id() returns NULL, which isn't handled
gracefully.

Similar to the GICv3 uaccess flow, check that kvm_get_vcpu_by_id()
actually returns something and fail the ioctl if not.

 References:
https://git.kernel.org/stable/c/4404465a1bee3607ad90a4c5f9e16dfd75b85728
https://git.kernel.org/stable/c/17db92da8be5dd3bf63c01f4109fe47db64fc66f
https://git.kernel.org/stable/c/3a5b0378ac6776c7c31b18e0f3c1389bd6005e80
https://git.kernel.org/stable/c/8d6a1c8e3de36cb0f5e866f1a582b00939e23104
https://git.kernel.org/stable/c/01981276d64e542c177b243f7c979fee855d5487
https://git.kernel.org/stable/c/6ddb4f372fc63210034b903d96ebbeb3c7195adb
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