CVE-2026-64309
crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)
Description
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.
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
- Apply the latest Linux kernel security updates.
- Ensure SEV initialization logic is robust.
- Verify documentation reflects actual command behavior.
- Test system stability after update.
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-2026-64309.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64309 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-2026-64309
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-2026-64309 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64309 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': '74768f73854d647a6462f252dc8782ab8a835211', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '7a361c74bb12f3398c388905f1d325be642cd36e', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '67ed191b4c8bdf432a3f32d1eb302880b4795cd1', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '5a1364da2f04217a36e2fdfa2db4ee025b383a20', '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': '74768f73854d647a6462f252dc8782ab8a835211', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '7a361c74bb12f3398c388905f1d325be642cd36e', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '67ed191b4c8bdf432a3f32d1eb302880b4795cd1', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '5a1364da2f04217a36e2fdfa2db4ee025b383a20', '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': '74768f73854d647a6462f252dc8782ab8a835211', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '7a361c74bb12f3398c388905f1d325be642cd36e', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '67ed191b4c8bdf432a3f32d1eb302880b4795cd1', 'versionType': 'git'}, {'status': 'affected', 'version': 'ceac7fb89e8da465aec3ac3c20477f912f5c3a6c', 'lessThan': '5a1364da2f04217a36e2fdfa2db4ee025b383a20', '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_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. Added Reference https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20 Added Reference https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1 Added Reference https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211 Added Reference https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e