{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "383d0b050106abecb82f43101cac94fa423af5cd"
            },
            {
              "fixed": "9b046de62b8098af6e2ba820b125ec9dc5f162c8"
            },
            {
              "fixed": "134f235e0e8de54611a72d3cc3f63e5f31246baa"
            },
            {
              "fixed": "4e2c7f7cbc27418f9a290399b986c1b85ff93b90"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.19.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89921.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Zero initialize data structures for inject_pfault_token\n\n__kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of\nthe on-stack struct kvm_s390_irq but the full ext substructure is copied\ninto the cpu local variable on inject. ext_params and pad contain stale\nstack values.\n\nInterrupt delivery only uses ext_params2, so nothing leaks to the guest,\nbut a host user can use the migration ioctls to get to the data.\n\nFix by zero-initializing the irq struct.\nDo the same for the inti data structure.",
  "id": "CVE-2026-89921",
  "modified": "2026-09-18T03:30:42.966844549Z",
  "published": "2026-09-16T10:32:15.413Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/134f235e0e8de54611a72d3cc3f63e5f31246baa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e2c7f7cbc27418f9a290399b986c1b85ff93b90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b046de62b8098af6e2ba820b125ec9dc5f162c8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89921.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89921"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "KVM: s390: Zero initialize data structures for inject_pfault_token"
}