{
  "cveId": "CVE-2026-80895",
  "url": "https://patchblox.com/security/cve/CVE-2026-80895",
  "summary": "CVE-2026-80895 is fixed in 14 products on 1 platform, first by DEBIAN-CVE-2026-80895, released September 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mshv: Order pt_vp_array publish against irqfd as...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mshv: Order pt_vp_array publish against irqfd assertion path  mshv_partition_ioctl_create_vp() initialises a VP struct (allocations, mutex_init, init_waitqueue_head, page mappings) and then publishes the pointer into partition-\u003Ept_vp_array.  Several ISR paths read this array locklessly: the intercept ISR, the two scheduler ISRs, and mshv_try_assert_irq_fast() on the irqfd fast path.  Of these, only mshv_try_assert_irq_fast() can structurally race the publish.  It runs from an eventfd waker without holding pt_mutex, and MSHV_IRQFD does not require the target lapic_apic_id (== vp_index) to refer to an existing VP at registration time.  A user can therefore register an irqfd targeting a yet-to-be-created VP, then trigger mshv_try_assert_irq_fast() concurrently with MSHV_CREATE_VP for the same index.  On weakly-ordered architectures the reader can observe a non-NULL pointer in pt_vp_array before the initialising stores to the VP struct become visible, leading to use of partially-initialised fields (e.g. vp_register_page).  The other ISR readers cannot reach this race: the hypervisor will not generate intercept or scheduler messages for a VP that has never been told to run, and the user can only call MSHV_RUN_VP on the VP fd returned by MSHV_CREATE_VP, which by construction is returned after the publish.  Leave those readers as plain loads.  Use smp_store_release() in mshv_partition_ioctl_create_vp() to publish the pointer, and pair it with smp_load_acquire() in mshv_try_assert_irq_fast().  On x86 these compile to plain accesses under TSO; on ARM64 they emit one-instruction acquire/release barriers, acceptable on this fast path.  The destroy-side path (destroy_partition() clearing pt_vp_array[i] to NULL after kfree(vp)) has a separate ordering and lifetime concern that is out of scope here.",
  "published": "2026-09-04T18:17:57Z",
  "severity": "",
  "epss": 0.00166,
  "epssPercentile": 0.05937,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "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 16.0",
      "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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      "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"
    },
    {
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      "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-default",
      "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"
    },
    {
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      "fix": "SUSE-SU-2026:24197-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24197-1",
      "released": "2026-11-07T00:44:01Z"
    },
    {
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "released": "2026-11-07T00:47:19Z"
    },
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      "fix": "SUSE-SU-2026:24235-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-24235-1",
      "released": "2026-11-07T00:44:01Z"
    },
    {
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      "product": "kernel-docs",
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      "fix": "OPENSUSE-SU-2026:22091-1",
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    },
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      "released": "2026-11-07T00:44:01Z"
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    {
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      "fix": "OPENSUSE-SU-2026:22091-1",
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    {
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      "fix": "SUSE-SU-2026:24235-1",
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      "released": "2026-11-07T00:44:01Z"
    },
    {
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      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "released": "2026-11-07T00:47:19Z"
    },
    {
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "released": "2026-11-07T00:47:19Z"
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      "released": "2026-11-07T00:44:01Z"
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    {
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      "fix": "OPENSUSE-SU-2026:22091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1",
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      "fix": "OPENSUSE-SU-2026:22091-1",
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      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1",
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      "released": "2026-11-07T00:44:01Z"
    },
    {
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      "fix": "OPENSUSE-SU-2026:22091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-22091-1",
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      "released": "2026-11-07T00:44:01Z"
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    {
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      "product": "linux",
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      "fix": "DEBIAN-CVE-2026-80895",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80895",
      "released": "2026-09-05T01:57:10Z"
    }
  ],
  "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"
  }
}