{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7270cc9157f474dfc46750a34c9d7defc686b2eb"
            },
            {
              "fixed": "970de111c087488e53cadf5480b94e0f695db985"
            },
            {
              "fixed": "3cefc1ab511fad6a0f708e7a4aee9f91346e9457"
            },
            {
              "fixed": "4c74e233cdedd11592775fae2a6243e67ca3f891"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98467.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix null ptr deref on nested wp/unmap, teardown race\n\nCommit 7270cc9157f4 (\"KVM: arm64: nv: Handle VNCR_EL2 invalidation from MMU\nnotifiers\") introduced VNCR_EL2 invalidation in both kvm_nested_s2_unmap()\nand kvm_nested_s2_wp().\n\nHowever at the point of this being performed concurrent stage 2 teardown of\na nested guest can cause kvm-\u003earch.mmu.pgt to be set to NULL.\n\nThis happens in kvm_flush_shadow_all() -\u003e kvm_arch_flush_shadow_all() -\u003e\nkvm_free_stage2_pgd() and is performed under the kvm-\u003emmu_lock.\n\nCommit ec14c272408a (\"KVM: arm64: nv: Unmap/flush shadow stage 2 page\ntables\") introduced the teardown of the entire nested MMU range, which then\ninvokes stage2_apply_range() with resched=true:\n\nmmu_notifier_invalidate_range_start()\n  -\u003e ... -\u003e kvm_mmu_notifier_invalidate_range_start()\n    -\u003e kvm_mmu_unmap_gfn_range()\n      -\u003e kvm_unmap_gfn_range()\n        -\u003e kvm_nested_s2_unmap()\n          -\u003e kvm_stage2_unmap_range()\n            -\u003e __unmap_stage2_range()\n                -\u003e stage2_apply_range()\n\nThis means that stage2_apply_range() can drop the kvm-\u003emmu_lock and thus\nconcurrent progress can be made in lockstep with\nkvm_arch_flush_shadow_all().\n\nIf kvm_arch_flush_shadow_all() advances ahead of stage2_apply_range() and\ncompletes its operation it guarantees a NULL pointer deref.\n\nSince kvm_free_stage2_pgd() is performed under the kvm-\u003emmu_lock this will\neither be observed NULL or not and serialised against\nkvm_free_stage2_pgd().\n\nResolve the issue by abstracting the invalidation to a new function,\nkvm_invalidate_vncr_ipa_all(), and check that the pgt is non-NULL before\ndereferencing it.",
  "id": "CVE-2026-98467",
  "modified": "2026-10-19T02:30:54.937886646Z",
  "published": "2026-10-18T15:15:19.294Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cefc1ab511fad6a0f708e7a4aee9f91346e9457"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c74e233cdedd11592775fae2a6243e67ca3f891"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/970de111c087488e53cadf5480b94e0f695db985"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98467.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98467"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "KVM: arm64: nv: Fix null ptr deref on nested wp/unmap, teardown race"
}