Vulnerability-Lookup

GHSA-VJ8P-CGF2-CWW7

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98928"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:13Z",
    "severity": null
  },
  "details": "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\u0027s SVE state from.\n\nDerive the flag from the bit, and drop the protected path\u0027s copy of the\nhost\u0027s flag, which is dead code since protected VMs are not allowed SVE.",
  "id": "GHSA-vj8p-cgf2-cww7",
  "modified": "2026-10-23T15:31:31Z",
  "published": "2026-10-23T15:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98928"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4efda204087145d40a84344edec7e9d3885ad3ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b5e99d286747b6b5b583b8efcd06bdbdd94b229"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98928 (GCVE-0-2026-98928)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:08 – Updated: 2026-10-23 12:08

Title

KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2

Summary

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

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/4efda204087145d40…
https://git.kernel.org/stable/c/7b5e99d286747b6b5…
https://git.kernel.org/stable/c/4f16c5fc8dc4c5596…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 41d6028e28bd474298ff10409c292ec46cf43a90 , < 4efda204087145d40a84344edec7e9d3885ad3ab (git) Affected: 41d6028e28bd474298ff10409c292ec46cf43a90 , < 7b5e99d286747b6b5b583b8efcd06bdbdd94b229 (git) Affected: 41d6028e28bd474298ff10409c292ec46cf43a90 , < 4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.55 , ≤ 6.18.* (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/pkvm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4efda204087145d40a84344edec7e9d3885ad3ab",
              "status": "affected",
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "versionType": "git"
            },
            {
              "lessThan": "7b5e99d286747b6b5b583b8efcd06bdbdd94b229",
              "status": "affected",
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "versionType": "git"
            },
            {
              "lessThan": "4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5",
              "status": "affected",
              "version": "41d6028e28bd474298ff10409c292ec46cf43a90",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/pkvm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.55",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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\u0027s SVE state from.\n\nDerive the flag from the bit, and drop the protected path\u0027s copy of the\nhost\u0027s flag, which is dead code since protected VMs are not allowed SVE."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:08:09.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4efda204087145d40a84344edec7e9d3885ad3ab"
        },
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          "url": "https://git.kernel.org/stable/c/7b5e99d286747b6b5b583b8efcd06bdbdd94b229"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f16c5fc8dc4c5596e3777ab9f449a54e3f85fd5"
        }
      ],
      "title": "KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98928",
    "datePublished": "2026-10-23T12:08:09.412Z",
    "dateReserved": "2026-09-25T10:25:14.380Z",
    "dateUpdated": "2026-10-23T12:08:09.412Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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