CVE-2022-49883 Information

Description

In the Linux kernel the following vulnerability has been resolved:

KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format

On 64 bit host if the guest doesn’t have X86_FEATURE_LM KVM will access 16 gprs to 32-bit smram image causing out-ouf-bound ram access.

On 32 bit host the rsm_load_state_64/enter_smm_save_state_64 is compiled out thus access overflow can’t happen.

Reference

https://git.kernel.org/stable/c/696db303e54f7352623d9f640e6c51d8fa9d5588 https://git.kernel.org/stable/c/a7ebfbea0f52550d7cdf12c38f3f5eaa7b2b6494