{
  "cveId": "CVE-2026-64070",
  "url": "https://patchblox.com/security/cve/CVE-2026-64070",
  "summary": "CVE-2026-64070 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2026-64070, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "powerpc/hv-gpci: fix preempt count leak in sysfs show paths",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  powerpc/hv-gpci: fix preempt count leak in sysfs show paths  Four sysfs show() callbacks in hv-gpci take get_cpu_var(hv_gpci_reqb) (which calls preempt_disable()) but only call the matching put_cpu_var() on the error path under the \u0027out:\u0027 label. Every successful read leaks one preempt_disable():    processor_bus_topology_show()   processor_config_show()   affinity_domain_via_virtual_processor_show()   affinity_domain_via_domain_show()  (affinity_domain_via_partition_show() was already correct.)  On a CONFIG_PREEMPT=y kernel, repeated reads raise preempt_count and eventually return to userspace with preemption still disabled. The next user-mode page fault then hits faulthandler_disabled() == 1, gets forced to SIGSEGV, and the resulting coredump trips \u0027BUG: scheduling while atomic\u0027 in call_usermodehelper_exec -\u003E wait_for_completion_state -\u003E schedule:    BUG: scheduling while atomic: \u003Ctask\u003E/\u003Cpid\u003E/0x00000004   ...   __schedule_bug\u002B0x6c/0x90   __schedule\u002B0x58c/0x13a0   schedule\u002B0x48/0x1a0   schedule_timeout\u002B0x104/0x170   wait_for_completion_state\u002B0x16c/0x330   call_usermodehelper_exec\u002B0x254/0x2d0   vfs_coredump\u002B0x1050/0x2590   get_signal\u002B0xb9c/0xc80   do_notify_resume\u002B0xf8/0x470  Add an out_success label that calls put_cpu_var() before returning the byte count, mirroring affinity_domain_via_partition_show().",
  "published": "2026-07-19T16:17:47Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00122,
  "epssPercentile": 0.01977,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64070",
  "fixes": [
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      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.39.1",
      "fix": "OPENSUSE-SU-2026:22091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.39.1",
      "fix": "OPENSUSE-SU-2026:22091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1",
      "released": "2026-11-07T00:47:19Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.87.3",
      "fix": "SUSE-SU-2026:4935-1",
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      "released": "2026-11-07T00:43:02Z"
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    {
      "platform": "linux",
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      "fixedVersion": "6.12.0-160000.39.1",
      "fix": "SUSE-SU-2026:24235-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24235-1",
      "released": "2026-11-07T00:44:01Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "released": "2026-11-07T00:47:19Z"
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  "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"
  }
}