PT-2026-64530 · Linux · Linux

CVE-2026-64309 · Publicado 2026-07-25 · Atualizado 2026-07-25

NVD

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

crypto: ccp - Do not initialize SNP for ioctl(SNP COMMIT)

Sashiko notes:

if SEV initialization fails and KVM is actively running normal VMs, could a userspace process trigger this code path via /dev/sev ioctls (e.g., SEV PDH GEN) and zero out MSR VM HSAVE PA globally? Would the next VMRUN execution for an active VM trigger a general protection fault and crash the host?

The SNP COMMIT command does not require the firmware to be in any particular state. Skip initializing it if it was previously uninitialized.

The SEV-SNP firmware specification doc 56860 does not mention SNP COMMIT in Table 5 as a command that is allowed in the UNINIT state, but it is in fact allowed and a future documentation update will reflect that.

Identificadores relacionados

CVE-2026-64309

Produtos afetados

Linux

Referências · 5

• https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1 · Nota
• https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211 · Nota
• https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20 · Nota
• https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-64309 · Nota de Segurança