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CVE-2026-64071 (GCVE-0-2026-64071)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-19 15:39
VLAI
Title
nvme-pci: fix use-after-free in nvme_free_host_mem()
Summary
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->hmb_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->hmb_sgt) but nvme_set_host_mem() fails with an I/O error: nvme_setup_host_mem() nvme_alloc_host_mem_single() -> sets dev->hmb_sgt nvme_set_host_mem() -> fails with -EIO nvme_free_host_mem() -> frees hmb_sgt, but does NOT NULL it return error nvme_probe() error path: nvme_free_host_mem() -> dev->hmb_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->sgl->dma_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+0x22/0x80 Call Trace: <TASK> dma_free_noncontiguous+0x3b/0x130 nvme_free_host_mem+0x30/0xf0 [nvme] nvme_probe.cold+0xcc/0x275 [nvme] local_pci_probe+0x43/0xa0 pci_device_probe+0xeea/0x290 really_probe+0xf9/0x3b0 __driver_probe_device+0x8b/0x170 driver_probe_device+0x24/0xd0 __driver_attach_async_helper+0x6b/0x110 async_run_entry_fn+0x37/0x170 process_one_work+0x1ac/0x3d0 worker_thread+0x1b8/0x360 kthread+0xf7/0x130 ret_from_fork+0x2d8/0x3a0 ret_from_fork_asm+0x1a/0x30 </TASK> Fix this by setting dev->hmb_sgt to NULL after freeing it, so the second call takes the multi-descriptor path which safely handles the already-cleaned-up state.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 63a5c7a4b4c49ad86c362e9f555e6f343804ee1d , < 9525e3a6fbb1d126a22ab2ee86ddea25af581a7c (git)
Affected: 63a5c7a4b4c49ad86c362e9f555e6f343804ee1d , < 7c89f474005d8377525d2991930b7432ee193a52 (git)
Affected: 63a5c7a4b4c49ad86c362e9f555e6f343804ee1d , < b35a13036755c5803168a7cb93bc66035c3e65b8 (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/pci.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-pci: fix use-after-free in nvme_free_host_mem()\n\nnvme_free_host_mem() frees dev-\u003ehmb_sgt via dma_free_noncontiguous()\nbut never clears the pointer afterward.  This leads to a use-after-free\nif nvme_free_host_mem() is called twice in the same error path.\n\nThis can happen during nvme_probe() when nvme_setup_host_mem() succeeds\nin allocating the HMB (setting dev-\u003ehmb_sgt) but nvme_set_host_mem()\nfails with an I/O error:\n\n  nvme_setup_host_mem()\n    nvme_alloc_host_mem_single()   -\u003e sets dev-\u003ehmb_sgt\n    nvme_set_host_mem()            -\u003e fails with -EIO\n    nvme_free_host_mem()           -\u003e frees hmb_sgt, but does NOT NULL it\n    return error\n\n  nvme_probe() error path:\n    nvme_free_host_mem()           -\u003e dev-\u003ehmb_sgt is stale, use-after-free\n\nThe second call dereferences the freed sgt, causing a NULL pointer\ndereference in iommu_dma_free_noncontiguous() when it accesses\nsgt-\u003esgl-\u003edma_address (the backing memory has been freed and zeroed).\n\nThis is reproducible on Thunderbolt-attached NVMe devices (e.g., OWC\nEnvoy Express behind a Dell WD22TB4 dock) where the device intermittently\nreturns I/O errors during HMB setup due to PCIe link instability.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n RIP: 0010:iommu_dma_free_noncontiguous+0x22/0x80\n Call Trace:\n  \u003cTASK\u003e\n  dma_free_noncontiguous+0x3b/0x130\n  nvme_free_host_mem+0x30/0xf0 [nvme]\n  nvme_probe.cold+0xcc/0x275 [nvme]\n  local_pci_probe+0x43/0xa0\n  pci_device_probe+0xeea/0x290\n  really_probe+0xf9/0x3b0\n  __driver_probe_device+0x8b/0x170\n  driver_probe_device+0x24/0xd0\n  __driver_attach_async_helper+0x6b/0x110\n  async_run_entry_fn+0x37/0x170\n  process_one_work+0x1ac/0x3d0\n  worker_thread+0x1b8/0x360\n  kthread+0xf7/0x130\n  ret_from_fork+0x2d8/0x3a0\n  ret_from_fork_asm+0x1a/0x30\n  \u003c/TASK\u003e\n\nFix this by setting dev-\u003ehmb_sgt to NULL after freeing it, so the\nsecond call takes the multi-descriptor path which safely handles the\nalready-cleaned-up state."
        }
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        "dateUpdated": "2026-07-19T15:39:47.162Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7c89f474005d8377525d2991930b7432ee193a52"
        },
        {
          "url": "https://git.kernel.org/stable/c/b35a13036755c5803168a7cb93bc66035c3e65b8"
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      ],
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    "dateReserved": "2026-07-19T07:54:57.031Z",
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This leads to a use-after-free\\nif nvme_free_host_mem() is called twice in the same error path.\\n\\nThis can happen during nvme_probe() when nvme_setup_host_mem() succeeds\\nin allocating the HMB (setting dev-\u003ehmb_sgt) but nvme_set_host_mem()\\nfails with an I/O error:\\n\\n  nvme_setup_host_mem()\\n    nvme_alloc_host_mem_single()   -\u003e sets dev-\u003ehmb_sgt\\n    nvme_set_host_mem()            -\u003e fails with -EIO\\n    nvme_free_host_mem()           -\u003e frees hmb_sgt, but does NOT NULL it\\n    return error\\n\\n  nvme_probe() error path:\\n    nvme_free_host_mem()           -\u003e dev-\u003ehmb_sgt is stale, use-after-free\\n\\nThe second call dereferences the freed sgt, causing a NULL pointer\\ndereference in iommu_dma_free_noncontiguous() when it accesses\\nsgt-\u003esgl-\u003edma_address (the backing memory has been freed and zeroed).\\n\\nThis is reproducible on Thunderbolt-attached NVMe devices (e.g., OWC\\nEnvoy Express behind a Dell WD22TB4 dock) where the device intermittently\\nreturns I/O errors during HMB setup due to PCIe link instability.\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000010\\n RIP: 0010:iommu_dma_free_noncontiguous+0x22/0x80\\n Call Trace:\\n  \u003cTASK\u003e\\n  dma_free_noncontiguous+0x3b/0x130\\n  nvme_free_host_mem+0x30/0xf0 [nvme]\\n  nvme_probe.cold+0xcc/0x275 [nvme]\\n  local_pci_probe+0x43/0xa0\\n  pci_device_probe+0xeea/0x290\\n  really_probe+0xf9/0x3b0\\n  __driver_probe_device+0x8b/0x170\\n  driver_probe_device+0x24/0xd0\\n  __driver_attach_async_helper+0x6b/0x110\\n  async_run_entry_fn+0x37/0x170\\n  process_one_work+0x1ac/0x3d0\\n  worker_thread+0x1b8/0x360\\n  kthread+0xf7/0x130\\n  ret_from_fork+0x2d8/0x3a0\\n  ret_from_fork_asm+0x1a/0x30\\n  \u003c/TASK\u003e\\n\\nFix this by setting dev-\u003ehmb_sgt to NULL after freeing it, so the\\nsecond call takes the multi-descriptor path which safely handles the\\nalready-cleaned-up 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-03T15:31:28+00:00",
      "cve": "CVE-2026-64071",
      "id": "CVE-2026-64071",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvme-pci: fix use-after-free in nvme_free_host_mem()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64071.json",
      "version": "3"
    }
  }
}



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