KVM: arm64: GICv2: Don't WARN on out-of-range GICV_DIR INTID

{
  "id": "173aa1f82564554fcde2391d7d25665bd50e01d7e6e205d27ad6c380c5fd1d75",
  "url": "https://osv.dev/vulnerability/CVE-2026-89727",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "KVM: arm64: GICv2: Don't WARN on out-of-range GICV_DIR INTID",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: GICv2: Don't WARN on out-of-range GICV_DIR INTID vgic_v2_deactivate() passes the INTID a guest wrote to GICV_DIR straight to vgic_get_vcpu_irq(), and treats a failed lookup as a \"can't happen\" condition with WARN_ON_ONCE(). The guest can make it happen at will, though: for any INTID outside of the implemented SGI, PPI and SPI ranges the lookup returns NULL, since GICv2 has no LPIs. A guest running with EOImode==1 writing such an INTID to GICV_DIR triggers the WARN, and panics hosts running with panic_on_warn. Drop the WARN and ignore failed lookups.",
    "evidence": "osv:CVE-2026-89727",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89727",
      "aliases": [
        "CVE-2026-89727"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "255de897e7fb918a34845167c572b5bf8e1d9d79"
                },
                {
                  "fixed": "78b95c571d021391153a5ac7981e9e4d5cc856a3"
                },
                {
                  "fixed": "c6d9c8ac6521d3049ec90ac58bebd23ed03ac496"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89727.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89727.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.244443684Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/78b95c571d021391153a5ac7981e9e4d5cc856a3",
        "https://git.kernel.org/stable/c/c6d9c8ac6521d3049ec90ac58bebd23ed03ac496",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89727.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89727",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89727.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89727",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518952,
  "published_at": "2026-09-11T19:46:38.291+00:00"
}