{
  "cveId": "CVE-2026-98150",
  "url": "https://patchblox.com/security/cve/CVE-2026-98150",
  "summary": "CVE-2026-98150 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98150 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix BPF_F_CPU validation for sparse CPU IDs...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix BPF_F_CPU validation for sparse CPU IDs  BPF_F_CPU stores the target CPU ID in the upper 32 bits of the map operation flags. bpf_map_check_op_flags() currently compares that ID with num_possible_cpus(), which is the number of possible CPUs rather than a bound on CPU IDs.  On an arm64 QEMU guest with a CPU device-tree hole, the possible CPU mask was 0,2-3. A userspace program using raw bpf() syscalls creates a BPF_MAP_TYPE_PERCPU_ARRAY and performs update and lookup operations for each CPU by setting BPF_F_CPU and the CPU ID in the flags.  With the old check, CPU 1 is incorrectly accepted while valid CPU 3 is rejected with -ERANGE. The CPU 1 update then reaches the per-CPU map access path and triggers:    Unable to handle kernel paging request at virtual address ...   pc : __pi_memcpy_generic\u002B0x5c/0x22c   lr : bpf_percpu_array_update\u002B0x2dc/0x2e8   Call trace:     __pi_memcpy_generic     bpf_map_update_value     map_update_elem     __sys_bpf  Check the CPU ID against nr_cpu_ids and cpu_possible() instead. This rejects CPU IDs outside the valid range and CPUs absent from the possible mask, while allowing valid sparse CPU IDs.",
  "published": "2026-09-25T11:17:46Z",
  "severity": "high",
  "cvss": 7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00101,
  "epssPercentile": 0.00897,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98150",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98150",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "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"
  }
}