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

KVM: arm64: GICv2: Don't WARN on out-of-range GICVDIR INTID

vgicv2deactivate() passes the INTID a guest wrote to GICVDIR straight to vgicgetvcpuirq(), and treats a failed lookup as a "can't happen" condition with WARNONONCE().

The guest can make it happen at will, though: for any INTID outside of the implemented SGI, PPI and SPI ranges the lookup returns NULL, since GICv2 has no LPIs. A guest running with EOImode==1 writing such an INTID to GICVDIR triggers the WARN, and panics hosts running with paniconwarn.

Drop the WARN and ignore failed lookups.