CVE-2022-49883: KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-01 · updated 2026-10-15
Weakness: CWE-125

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.

Affected products

Linux kernel: from 6.0 before 6.0.8; 6.1-rc1, 6.1-rc2, 6.1-rc3 — fixed in 6.0.8

How to fix

Upgrade to a fixed version: Linux kernel 6.0.8. Check the vendor advisory for mitigations.

References

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