{
  "cveId": "CVE-2026-98546",
  "url": "https://patchblox.com/security/cve/CVE-2026-98546",
  "summary": "CVE-2026-98546 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98546, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "arm64/boot: Disable trapping of PMZR_EL0 writes to EL2",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  arm64/boot: Disable trapping of PMZR_EL0 writes to EL2  __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message.  Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits.",
  "published": "2026-10-18T16:17:06Z",
  "severity": "",
  "epss": 0.002,
  "epssPercentile": 0.09934,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98546",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-98546",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98546",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98546",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98546",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.113-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-98546",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98546",
      "released": "2026-10-19T16:27:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}