CVE-2026-64307crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)
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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Free account, 1 product
In 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
- 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 345a6e869b33687e9268044bcaeeefd7c61da675; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 441ea32cf2755a0dc593557056b00b7caa0651f5; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 20f548cdac94860a164e5ebba4f7e4a01051cb06; from ceac7fb89e8da465aec3ac3c20477f912f5c3a6c before 08f0e65e784c4b20e6e620dd4f68d8636073a3d2; from 6.12.75 before 6.12.97 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12.75 before 6.12.97; from 6.16 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675patch
- https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5patch
- https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06patch
- https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2patch
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.