Vulnerability CVE-2024-46707
Published: 2024-09-13

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

KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3

On a system with a GICv3, if a guest hasn't been configured with
GICv3 and that the host is not capable of GICv2 emulation,
a write to any of the ICC_*SGI*_EL1 registers is trapped to EL2.

We therefore try to emulate the SGI access, only to hit a NULL
pointer as no private interrupt is allocated (no GIC, remember?).

The obvious fix is to give the guest what it deserves, in the
shape of a UNDEF exception.

 References:
https://git.kernel.org/stable/c/15818af2f7aa55eff375333cb7689df15d3f24ef
https://git.kernel.org/stable/c/96b076e8ee5bc3a1126848c8add0f74bd30dc9d1
https://git.kernel.org/stable/c/94d4fbad01b19ec5eab3d6b50aaec4f9db8b2d8d
https://git.kernel.org/stable/c/9d7629bec5c3f80bd0e3bf8103c06a2f7046bd92
https://git.kernel.org/stable/c/2073132f6ed3079369e857a8deb33d11bdd983bc
https://git.kernel.org/stable/c/3e6245ebe7ef341639e9a7e402b3ade8ad45a19f
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