CVE-2026-98928

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2 pkvm_init_features_from_host() takes KVM_ARCH_FLAG_GUEST_HAS_SVE and KVM_ARM_VCPU_SVE from the host separately, but pkvm_vcpu_init_sve() tests the bit while vcpu_has_sve() reads the flag. A host that sets the flag without the bit gets a vCPU with a NULL sve_state that the world switch loads the guest's SVE state from. Derive the flag from the bit, and drop the protected path's copy of the host's flag, which is dead code since protected VMs are not allowed SVE.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-23 13:17:13.567000

Last modified

2026-10-23 13:17:13.567000

View original CVE JSON

{
  "id": "CVE-2026-98928",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-23T13:17:13.567",
  "lastModified": "2026-10-23T13:17:13.567",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2\n\npkvm_init_features_from_host() takes KVM_ARCH_FLAG_GUEST_HAS_SVE and\nKVM_ARM_VCPU_SVE from the host separately, but pkvm_vcpu_init_sve()\ntests the bit while vcpu_has_sve() reads the flag. A host that sets the\nflag without the bit gets a vCPU with a NULL sve_state that the world\nswitch loads the guest's SVE state from.\n\nDerive the flag from the bit, and drop the protected path's copy of the\nhost's flag, which is dead code since protected VMs are not allowed SVE."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/pkvm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "lessThan": "4efda204087145d40a84344edec7e9d3885ad3ab",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "lessThan": "7b5e99d286747b6b5b583b8efcd06bdbdd94b229",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "lessThan": "4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/pkvm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.14",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.55",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.9",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4efda204087145d40a84344edec7e9d3885ad3ab",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7b5e99d286747b6b5b583b8efcd06bdbdd94b229",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}