{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "686d8f7b592f3466f44aea653c8147611b351c83"
            },
            {
              "fixed": "bb8c90c86441c090e9036f019cf1b4d7894a2c40"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "858c7bfcb35e1100b58bb63c9f562d86e09418d9"
            },
            {
              "fixed": "071f51188a5d8ec10535541255587976d12fc7d8"
            },
            {
              "fixed": "ce71865bf43f88bed9d9218e9218e537150be506"
            },
            {
              "fixed": "2bc6b218717b9d08f466f88209251d54bc09b207"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.25"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.14.4"
            },
            {
              "fixed": "6.15"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "882f78400322c0aec4b641a7168adad9a66bc0c2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.55"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "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-2026-98546.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/boot: Disable trapping of PMZR_EL0 writes to EL2\n\n__init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2.\nPMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in\nHDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host\ntraps to EL2, where the nVHE hypervisor has no handler and BUG()s. The\nkernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU\ndriver set PMUSERENR_EL0.UEN for a task with a user-read event, so a\nwrite from EL0 reaches the trap and takes the host down without a panic\nmessage.\n\nAccumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already\ndoes for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9\nbits.",
  "id": "CVE-2026-98546",
  "modified": "2026-10-19T02:30:23.897639715Z",
  "published": "2026-10-18T15:18:14.808Z",
  "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/071f51188a5d8ec10535541255587976d12fc7d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98546.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98546"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "arm64/boot: Disable trapping of PMZR_EL0 writes to EL2"
}