CVE-2026-64308crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)
Updated under an hour ago ()
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It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 before 61cf5eef20657bff9ca235fe938a99ce5ff65c06; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 8836801847b9479ac046cb18a24981e1b0b05e9d; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before f91e9dbb5845d1e5abf1028e6df57dcf61583e1b; from 6.12.75 before 6.12.96 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12.75 before 6.12.96; from 6.16 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06patch
- https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4patch
- https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9dpatch
- https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1bpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.