CVE-2026-72239

CriticalCVSS 9.3/10Last modified Aug 17, 2026

Description

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

x86/virt/sev: Revert "Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN"

Revert

99cf1fb58e68 ("x86/virt/sev: Drop WBINVD before setting MSR_AMD64_SYSCFG_SNP_EN").

Section 8.8 of the SNP spec says:

Before invoking SNP_INIT_EX with INIT_RMP set to 1, software must ensure that no CPUs contain dirty cache lines for the memory containing the RMP.

Cachelines can be moved from cache to cache in a dirty state. The wbinvd_on_all_cpus() before SNP_INIT_EX flushes the caches for each CPU, but if the IPIs for WBINVD race with this dirty cacheline movement, it is possible that they may not get flushed, violating the firmware requirement.

Doing wbinvd_on_all_cpus() before setting SNPEn is safer since the RMP table is not yet in use.

[ Heroically bisected by Srikanth. ] [ bp: Massage commit message. ]

Metrics

CVSS 3.1 9.3/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 99cf1fb58e68291d408b4c4484181cf88f081857, < e5158ff53fdff9c229bf13aa5f75eb17cdcfcd2d; >= 99cf1fb58e68291d408b4c4484181cf88f081857, < 4c2509f3b79756679a02bea649c6a7501b58f52c
LinuxLinux7.1

References

Timeline

Published
Aug 15, 2026
Last modified
Aug 17, 2026
NVD status
Received

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