CVE-2026-64308None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD) Sashiko notes: > if SEV initialization fails and KVM is actively running normal VMs, could a > userspace …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)
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 SEV firmware docs for SNP_VLEK_LOAD note:
On SNP_SHUTDOWN, the VLEK is deleted.
That is, the initialization/shutdown wrapper here is pointless, because the firmware immediately throws away the key anyway. Instead, refuse to do anything if SNP has not been previously initialized.
This is an ABI break: before, this was a no-op and almost certainly a mistake by userspace, and now it returns -ENODEV. ABI compatibility could be maintained here by simply returning 0 in the check instead.
Linux >= 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 < 61cf5eef20657bff9ca235fe938a99ce5ff65c06Linux >= ceac7fb89e8da465aec3ac3c20477f912f5c3a6c < 92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4Linux >= ceac7fb89e8da465aec3ac3c20477f912f5c3a6c < 8836801847b9479ac046cb18a24981e1b0b05e9dLinux >= ceac7fb89e8da465aec3ac3c20477f912f5c3a6c < f91e9dbb5845d1e5abf1028e6df57dcf61583e1bLinux >= 6.12.75 < 6.12.96Linux 6.16Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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