In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2
It is entirely possible for a guest to write to the ZCR_EL2 sysreg alias
while in a nested context, as it is expected if FEAT_NV2 is advertised
to the L1 hypervisor.
Get rid of the bogus WARN which, since the hyp vectors were installed at
this point, has the effect of a hyp_panic...
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 4
https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0
416baaa9-dc9f-4396-8d5f-8c081fb06d67