CVE-2026-64309 (GCVE-0-2026-64309)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"drivers/crypto/ccp/sev-dev.c"
],
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"vendor": "Linux",
"versions": [
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"vendor": "Linux",
"versions": [
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"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.39",
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{
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"status": "unaffected",
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{
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"cpeApplicability": [
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"vulnerable": true
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\n\nSashiko notes:\n\n\u003e if SEV initialization fails and KVM is actively running normal VMs, could a\n\u003e userspace process trigger this code path via /dev/sev ioctls (e.g.,\n\u003e SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n\u003e execution for an active VM trigger a general protection fault and crash the\n\u003e host?\n\nThe SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:53:08.770Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211"
},
{
"url": "https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"
},
{
"url": "https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"
},
{
"url": "https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"
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],
"title": "crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)",
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"cveId": "CVE-2026-64309",
"datePublished": "2026-07-25T08:49:42.035Z",
"dateReserved": "2026-07-19T15:36:31.779Z",
"dateUpdated": "2026-08-17T04:53:08.770Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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