FKIE_CVE-2026-64288

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-30 15:00
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions, and either can race against a vcpu not being onlined yet (no pseudo-TLB allocated). Similarly, the TLB might be invalid, and the invalidation should be skipped in this case. Both kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are expected to perform the same checks, except that the latter doesn't check for the allocation and blindly dereferences the pointer. Solve this by introducing a new iterator built on top of the usual kvm_for_each_vcpu() that checks for both of the above conditions, and convert the two users to it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7c73a269a880b1399baacfb9d521415e6ef7ecc2",
              "status": "affected",
              "version": "4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929",
              "versionType": "git"
            },
            {
              "lessThan": "5fd30133af864a1de0a0bd87d3fe3cf23205fbc7",
              "status": "affected",
              "version": "4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929",
              "versionType": "git"
            },
            {
              "lessThan": "4be6cbeb93d26994bd1827ddbce391e3c4395c8f",
              "status": "affected",
              "version": "4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB\n\nVNCR TLB invalidation occurs from MMU notifiers or TLBI instructions,\nand either can race against a vcpu not being onlined yet (no pseudo-TLB\nallocated). Similarly, the TLB might be invalid, and the invalidation\nshould be skipped in this case.\n\nBoth kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are\nexpected to perform the same checks, except that the latter doesn\u0027t\ncheck for the allocation and blindly dereferences the pointer.\n\nSolve this by introducing a new iterator built on top of the usual\nkvm_for_each_vcpu() that checks for both of the above conditions,\nand convert the two users to it."
    }
  ],
  "id": "CVE-2026-64288",
  "lastModified": "2026-07-30T15:00:27.343",
  "metrics": {},
  "published": "2026-07-25T10:17:09.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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