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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-17 04:53
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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            "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."
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\n\ncrypto: ccp - No inicializar SNP para ioctls de SEV\n\nNotas de Sashiko:\n\n\u003e si la inicializaci\u00f3n de SEV falla y KVM est\u00e1 ejecutando activamente VMs normales, \u00bfpodr\u00eda un\n\u003e proceso de espacio de usuario activar esta ruta de c\u00f3digo a trav\u00e9s de ioctls de /dev/sev (p. ej.,\n\u003e SEV_PDH_GEN) y poner a cero MSR_VM_HSAVE_PA globalmente? \u00bfLa siguiente ejecuci\u00f3n de VMRUN\n\u003e para una VM activa activar\u00eda una falla de protecci\u00f3n general y colapsar\u00eda el\n\u003e host?\n\nsev_move_to_init_state() se llama para ioctls que requieren solo firmware de SEV:\nSEV_PEK_GEN, SEV_PDH_GEN, SEV_PEK_CSR, SEV_PEK_CERT_IMPORT y\nSEV_PDH_CERT_EXPORT. Despu\u00e9s del comando de firmware, realiza SEV_SHUTDOWN en\nel firmware de SEV. Dado que estos comandos no requieren que SNP sea\ninicializado, se omite llamando a __sev_platform_init_locked() que solo\ninicializa el firmware de SEV. De esta manera, SNP no se inicializa en absoluto, y\nHSAVE_PA no se borra.\n\nEl c\u00f3digo anterior guardaba cualquier error de firmware de inicializaci\u00f3n de SEV en\ninit_args.error y luego lo descartaba y codificaba el valor de retorno de\nINVALID_PLATFORM_STATE independientemente del error real del firmware. Este parche\nlo cambia para mostrar el error subyacente, lo que, con suerte, es m\u00e1s\n\u00fatil y no causa ning\u00fan problema.\n\nTenga en cuenta que sigue siendo seguro llamar a __sev_firmware_shutdown() directamente:\nllama a __sev_snp_shutdown_locked(), que omite el apagado de SNP si SNP no fue\ninicializado."
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      "cve": "CVE-2026-64310",
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      "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"
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      "cve": "CVE-2026-64310",
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      "product_status:known_affected": "2",
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      "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": "7"
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}



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