5.5

CVE-2026-64309

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.12.75 < 6.12.96
Linux ≫ Linux Kernel Version >= 6.16 < 6.18.39
Linux ≫ Linux Kernel Version >= 6.19 < 7.1.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.121
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-908 Use of Uninitialized Resource

The product uses or accesses a resource that has not been initialized.

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