{
  "cveId": "CVE-2026-98283",
  "url": "https://patchblox.com/security/cve/CVE-2026-98283",
  "summary": "CVE-2026-98283 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98283, released October 6, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid()  kvmhv_emulate_tlbie_all_lpid() iterates the nested-guest IDR and drops mmu_lock before calling kvmhv_emulate_tlbie_lpid(), but does not hold a reference on the kvm_nested_guest pointer obtained from the IDR.  A concurrent vCPU issuing a single-LPID tlbie (is=2, ric=2) can race through kvmhv_flush_nested() -\u003E kvmhv_remove_nested() -\u003E idr_remove / --refcnt -\u003E kvmhv_release_nested() -\u003E kfree(gp) in that window, leaving the iterating vCPU with a dangling pointer.  The subsequent mutex_lock(\u0026gp-\u003Etlb_lock) and accesses to gp-\u003Eshadow_pgtable, gp-\u003Eshadow_lpid and gp-\u003El1_host all touch freed memory.  The free path is fully L1-controlled.  Fix this by incrementing gp-\u003Erefcnt inside the loop before dropping mmu_lock, mirroring what kvmhv_get_nested() does, and releasing the reference with kvmhv_put_nested() after the per-guest work completes. This is the same get/put discipline already used at every other call site that drops mmu_lock while holding a nested-guest pointer.",
  "published": "2026-10-06T09:18:18Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00126,
  "epssPercentile": 0.02275,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98283",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-98283",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98283",
      "released": "2026-10-06T21:56:27Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-98283",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98283",
      "released": "2026-10-06T21:56:27Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.8-1",
      "fix": "DEBIAN-CVE-2026-98283",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98283",
      "released": "2026-10-06T21:56:27Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.113-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-98283",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98283",
      "released": "2026-10-06T21:56:27Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}