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

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Summary

CVECVE-2026-64307
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:11 UTC
Updated2026-07-25 10:17:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG) 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? Refuse to re-try initialization if SNP is not already initialized for SNP_CONFIG. This is technically an ABI break: before if SNP initialization failed it could be transparently retriggered by this ioctl, and if no VMs were running, everything worked fine. Hopefully this is enough of a corner case that nobody will notice, but someone does, there are a few options: * do something like symbol_get() for kvm and refuse to initialize if KVM is loaded * check each cpu's HSAVE_PA for non-zero data before re-initializing * once initialization has failed, continue to refuse to initialize until the ccp module is unloaded

Risk And Classification

EPSS: 0.002150000 probability, percentile 0.121210000 (date 2026-07-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 345a6e869b33687e9268044bcaeeefd7c61da675 git Not specified
CNA Linux Linux affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c 441ea32cf2755a0dc593557056b00b7caa0651f5 git Not specified
CNA Linux Linux affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c 20f548cdac94860a164e5ebba4f7e4a01051cb06 git Not specified
CNA Linux Linux affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c 08f0e65e784c4b20e6e620dd4f68d8636073a3d2 git Not specified
CNA Linux Linux affected 6.12.75 6.12.97 semver Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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