CVE-2026-64310 (GCVE-0-2026-64310)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49
VLAI
Title
crypto: ccp - Do not initialize SNP for SEV ioctls
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for SEV ioctls 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? sev_move_to_init_state() is called for ioctls requiring only SEV firmware: SEV_PEK_GEN, SEV_PDH_GEN, SEV_PEK_CSR, SEV_PEK_CERT_IMPORT, and SEV_PDH_CERT_EXPORT. After the firmware command, it does SEV_SHUTDOWN on the SEV firmware. Since these commands do not require SNP to be initialized, skip it by calling __sev_platform_init_locked() which only initializes the SEV firmware. This way SNP is not Initialized at all, and HSAVE_PA is not cleared. The previous code saved any SEV initialization firmware error to init_args.error and then threw it away and hardcoded the return value of INVALID_PLATFORM_STATE regardless of the real firmware error. This patch changes it to surface the underlying error, which is hopefully both more useful and doesn't cause any problems. Note that it is still safe to call __sev_firmware_shutdown() directly: it calls __sev_snp_shutdown_locked(), which skips SNP shutdown if SNP was not initialized.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 , < 5181e88da99c3d1d41e25db3472a62b8d4b42cdd (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 9e983d0a74a6a2348e4ce61647ec8a4dfbe198ac (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < d51207735e7c224cf591fa260c557a451a69a5cf (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < fb1758e74b8061aacfbce7bbb7a7cc650537e167 (git)
Affected: 6.12.75 , < 6.12.96 (semver)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "6.16"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
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              "operator": "OR"
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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 SEV ioctls\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\nsev_move_to_init_state() is called for ioctls requiring only SEV firmware:\nSEV_PEK_GEN, SEV_PDH_GEN, SEV_PEK_CSR, SEV_PEK_CERT_IMPORT, and\nSEV_PDH_CERT_EXPORT. After the firmware command, it does SEV_SHUTDOWN on\nthe SEV firmware. Since these commands do not require SNP to be\ninitialized, skip it by calling __sev_platform_init_locked() which only\ninitializes the SEV firmware. This way SNP is not Initialized at all, and\nHSAVE_PA is not cleared.\n\nThe previous code saved any SEV initialization firmware error to\ninit_args.error and then threw it away and hardcoded the return value of\nINVALID_PLATFORM_STATE regardless of the real firmware error. This patch\nchanges it to surface the underlying error, which is hopefully both more\nuseful and doesn\u0027t cause any problems.\n\nNote that it is still safe to call __sev_firmware_shutdown() directly: it\ncalls __sev_snp_shutdown_locked(), which skips SNP shutdown if SNP was not\ninitialized."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:42.683Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5181e88da99c3d1d41e25db3472a62b8d4b42cdd"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e983d0a74a6a2348e4ce61647ec8a4dfbe198ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/d51207735e7c224cf591fa260c557a451a69a5cf"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb1758e74b8061aacfbce7bbb7a7cc650537e167"
        }
      ],
      "title": "crypto: ccp - Do not initialize SNP for SEV ioctls",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64310",
    "datePublished": "2026-07-25T08:49:42.683Z",
    "dateReserved": "2026-07-19T15:36:31.779Z",
    "dateUpdated": "2026-07-25T08:49:42.683Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-08-03",
      "epss": "0.00215",
      "percentile": "0.12064"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64310\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:12.147\",\"lastModified\":\"2026-07-25T10:17:12.147\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncrypto: ccp - Do not initialize SNP for SEV ioctls\\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\\nsev_move_to_init_state() is called for ioctls requiring only SEV firmware:\\nSEV_PEK_GEN, SEV_PDH_GEN, SEV_PEK_CSR, SEV_PEK_CERT_IMPORT, and\\nSEV_PDH_CERT_EXPORT. After the firmware command, it does SEV_SHUTDOWN on\\nthe SEV firmware. Since these commands do not require SNP to be\\ninitialized, skip it by calling __sev_platform_init_locked() which only\\ninitializes the SEV firmware. This way SNP is not Initialized at all, and\\nHSAVE_PA is not cleared.\\n\\nThe previous code saved any SEV initialization firmware error to\\ninit_args.error and then threw it away and hardcoded the return value of\\nINVALID_PLATFORM_STATE regardless of the real firmware error. This patch\\nchanges it to surface the underlying error, which is hopefully both more\\nuseful and doesn\u0027t cause any problems.\\n\\nNote that it is still safe to call __sev_firmware_shutdown() directly: it\\ncalls __sev_snp_shutdown_locked(), which skips SNP shutdown if SNP was not\\ninitialized.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/crypto/ccp/sev-dev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7\",\"lessThan\":\"5181e88da99c3d1d41e25db3472a62b8d4b42cdd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c\",\"lessThan\":\"9e983d0a74a6a2348e4ce61647ec8a4dfbe198ac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c\",\"lessThan\":\"d51207735e7c224cf591fa260c557a451a69a5cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c\",\"lessThan\":\"fb1758e74b8061aacfbce7bbb7a7cc650537e167\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.12.75\",\"lessThan\":\"6.12.96\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/crypto/ccp/sev-dev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5181e88da99c3d1d41e25db3472a62b8d4b42cdd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e983d0a74a6a2348e4ce61647ec8a4dfbe198ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d51207735e7c224cf591fa260c557a451a69a5cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb1758e74b8061aacfbce7bbb7a7cc650537e167\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T03:31:19+00:00",
      "cve": "CVE-2026-64310",
      "id": "CVE-2026-64310",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: ccp - Do not initialize SNP for SEV ioctls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64310.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:46:01Z",
      "cve": "CVE-2026-64310",
      "id": "CVE-2026-64310",
      "initial_release_date": "2026-07-25T16:46:01Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64310",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64310.json",
      "version": "2"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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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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