CVE-2026-64307 (GCVE-0-2026-64307)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-17 04:53
VLAI
Title
crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)
Summary
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
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 , < 345a6e869b33687e9268044bcaeeefd7c61da675 (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 441ea32cf2755a0dc593557056b00b7caa0651f5 (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 20f548cdac94860a164e5ebba4f7e4a01051cb06 (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 08f0e65e784c4b20e6e620dd4f68d8636073a3d2 (git)
Affected: 6.12.75 , < 6.12.97 (semver)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "title": "SUSE CVE CVE-2026-64307",
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}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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