CVE-2026-64308
crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)
Description
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Ensure SEV firmware is properly initialized.
- Refuse SNP operations if not initialized.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64308.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64308 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64308
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64308 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64308 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1c3506ea8599a3ad1b9aae5cbd573134f8d18db7', 'lessThan': '61cf5eef20657bff9ca235fe938a99ce5ff65c06', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '8836801847b9479ac046cb18a24981e1b0b05e9d', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': 'f91e9dbb5845d1e5abf1028e6df57dcf61583e1b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.75', 'lessThan': '6.12.96', 'versionType': 'semver'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1c3506ea8599a3ad1b9aae5cbd573134f8d18db7', 'lessThan': '61cf5eef20657bff9ca235fe938a99ce5ff65c06', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '8836801847b9479ac046cb18a24981e1b0b05e9d', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': 'f91e9dbb5845d1e5abf1028e6df57dcf61583e1b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.75', 'lessThan': '6.12.96', 'versionType': 'semver'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1c3506ea8599a3ad1b9aae5cbd573134f8d18db7', 'lessThan': '61cf5eef20657bff9ca235fe938a99ce5ff65c06', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '8836801847b9479ac046cb18a24981e1b0b05e9d', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': 'f91e9dbb5845d1e5abf1028e6df57dcf61583e1b', 'versionType': 'git'}, {'status': 'affected', 'version': '6.12.75', 'lessThan': '6.12.96', 'versionType': 'semver'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/crypto/ccp/sev-dev.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06 Added Reference https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d Added Reference https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4 Added Reference https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b