Bug 2363446 (CVE-2022-49883)

Summary: CVE-2022-49883 kernel: KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-01 15:04:57 UTC
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.

Comment 1 Avinash Hanwate 2025-05-02 03:36:46 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050155-CVE-2022-49883-ba54@gregkh/T