Medium 5.5Published Jul 25, 2026

CVE-2026-64309crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)

Updated under an hour ago (Oct 27, 2026, 1:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

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

Affected products

Linux Linux linux:linux (from the name)	from 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 before 74768f73854d647a6462f252dc8782ab8a835211; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 7a361c74bb12f3398c388905f1d325be642cd36e; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 67ed191b4c8bdf432a3f32d1eb302880b4795cd1; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 5a1364da2f04217a36e2fdfa2db4ee025b383a20; 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

References

https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211	patch
https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e	patch
https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1	patch
https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20	patch

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.