CVE-2026-72239
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. ]
How to fix
- Linux Linuxe5158ff53fdff9c229bf13aa5f75eb17cdcfcd2d, 4c2509f3b79756679a02bea649c6a7501b58f52c or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 99cf1fb58e68291d408b4c4484181cf88f081857 ≤ v < e5158ff53fdff9c229bf13aa5f75eb17cdcfcd2d, 99cf1fb58e68291d408b4c4484181cf88f081857 ≤ v < 4c2509f3b79756679a02bea649c6a7501b58f52c, 7.1 | e5158ff53fdff9c229bf13aa5f75eb17cdcfcd2d, 4c2509f3b79756679a02bea649c6a7501b58f52c |
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