{
  "cveId": "CVE-2026-64071",
  "url": "https://patchblox.com/security/cve/CVE-2026-64071",
  "summary": "CVE-2026-64071 is fixed in 33 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  nvme-pci: fix use-after-free in nvme_free_host_m...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  nvme-pci: fix use-after-free in nvme_free_host_mem()  nvme_free_host_mem() frees dev-\u003Ehmb_sgt via dma_free_noncontiguous() but never clears the pointer afterward.  This leads to a use-after-free if nvme_free_host_mem() is called twice in the same error path.  This can happen during nvme_probe() when nvme_setup_host_mem() succeeds in allocating the HMB (setting dev-\u003Ehmb_sgt) but nvme_set_host_mem() fails with an I/O error:    nvme_setup_host_mem()     nvme_alloc_host_mem_single()   -\u003E sets dev-\u003Ehmb_sgt     nvme_set_host_mem()            -\u003E fails with -EIO     nvme_free_host_mem()           -\u003E frees hmb_sgt, but does NOT NULL it     return error    nvme_probe() error path:     nvme_free_host_mem()           -\u003E dev-\u003Ehmb_sgt is stale, use-after-free  The second call dereferences the freed sgt, causing a NULL pointer dereference in iommu_dma_free_noncontiguous() when it accesses sgt-\u003Esgl-\u003Edma_address (the backing memory has been freed and zeroed).  This is reproducible on Thunderbolt-attached NVMe devices (e.g., OWC Envoy Express behind a Dell WD22TB4 dock) where the device intermittently returns I/O errors during HMB setup due to PCIe link instability.   BUG: kernel NULL pointer dereference, address: 0000000000000010  RIP: 0010:iommu_dma_free_noncontiguous\u002B0x22/0x80  Call Trace:   \u003CTASK\u003E   dma_free_noncontiguous\u002B0x3b/0x130   nvme_free_host_mem\u002B0x30/0xf0 [nvme]   nvme_probe.cold\u002B0xcc/0x275 [nvme]   local_pci_probe\u002B0x43/0xa0   pci_device_probe\u002B0xeea/0x290   really_probe\u002B0xf9/0x3b0   __driver_probe_device\u002B0x8b/0x170   driver_probe_device\u002B0x24/0xd0   __driver_attach_async_helper\u002B0x6b/0x110   async_run_entry_fn\u002B0x37/0x170   process_one_work\u002B0x1ac/0x3d0   worker_thread\u002B0x1b8/0x360   kthread\u002B0xf7/0x130   ret_from_fork\u002B0x2d8/0x3a0   ret_from_fork_asm\u002B0x1a/0x30   \u003C/TASK\u003E  Fix this by setting dev-\u003Ehmb_sgt to NULL after freeing it, so the second call takes the multi-descriptor path which safely handles the already-cleaned-up state.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00133,
  "epssPercentile": 0.02837,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "product": "bpftool6.18",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1881",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881",
      "released": "2026-06-22T09:00:00Z"
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    {
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      "fix": "ALAS2023-2026-1881",
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      "released": "2026-06-22T09:00:00Z"
    },
    {
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      "fix": "OPENSUSE-SU-2026:21910-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1",
      "released": "2026-09-22T15:26:20Z"
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    {
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      "release": "opensuse-leap 16.0",
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      "fix": "OPENSUSE-SU-2026:21910-1",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}