CVE-2025-38658 (GCVE-0-2025-38658)
Vulnerability from cvelistv5
Published
2025-08-22 16:01
Modified
2025-08-22 16:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: pci-epf: Do not complete commands twice if nvmet_req_init() fails Have nvmet_req_init() and req->execute() complete failed commands. Description of the problem: nvmet_req_init() calls __nvmet_req_complete() internally upon failure, e.g., unsupported opcode, which calls the "queue_response" callback, this results in nvmet_pci_epf_queue_response() being called, which will call nvmet_pci_epf_complete_iod() if data_len is 0 or if dma_dir is different from DMA_TO_DEVICE. This results in a double completion as nvmet_pci_epf_exec_iod_work() also calls nvmet_pci_epf_complete_iod() when nvmet_req_init() fails. Steps to reproduce: On the host send a command with an unsupported opcode with nvme-cli, For example the admin command "security receive" $ sudo nvme security-recv /dev/nvme0n1 -n1 -x4096 This triggers a double completion as nvmet_req_init() fails and nvmet_pci_epf_queue_response() is called, here iod->dma_dir is still in the default state of "DMA_NONE" as set by default in nvmet_pci_epf_alloc_iod(), so nvmet_pci_epf_complete_iod() is called. Because nvmet_req_init() failed nvmet_pci_epf_complete_iod() is also called in nvmet_pci_epf_exec_iod_work() leading to a double completion. This not only sends two completions to the host but also corrupts the state of the PCI NVMe target leading to kernel oops. This patch lets nvmet_req_init() and req->execute() complete all failed commands, and removes the double completion case in nvmet_pci_epf_exec_iod_work() therefore fixing the edge cases where double completions occurred.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/746d0ac5a07d5da952ef258dd4d75f0b26c96476
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a535c0b10060bc8c174a7964b0f98064ee0c4774
Impacted products
Vendor Product Version
Linux Linux Version: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186
Version: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186
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   Linux Linux Version: 6.14
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/pci-epf.c"
          ],
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              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: pci-epf: Do not complete commands twice if nvmet_req_init() fails\n\nHave nvmet_req_init() and req-\u003eexecute() complete failed commands.\n\nDescription of the problem:\nnvmet_req_init() calls __nvmet_req_complete() internally upon failure,\ne.g., unsupported opcode, which calls the \"queue_response\" callback,\nthis results in nvmet_pci_epf_queue_response() being called, which will\ncall nvmet_pci_epf_complete_iod() if data_len is 0 or if dma_dir is\ndifferent from DMA_TO_DEVICE. This results in a double completion as\nnvmet_pci_epf_exec_iod_work() also calls nvmet_pci_epf_complete_iod()\nwhen nvmet_req_init() fails.\n\nSteps to reproduce:\nOn the host send a command with an unsupported opcode with nvme-cli,\nFor example the admin command \"security receive\"\n$ sudo nvme security-recv /dev/nvme0n1 -n1 -x4096\n\nThis triggers a double completion as nvmet_req_init() fails and\nnvmet_pci_epf_queue_response() is called, here iod-\u003edma_dir is still\nin the default state of \"DMA_NONE\" as set by default in\nnvmet_pci_epf_alloc_iod(), so nvmet_pci_epf_complete_iod() is called.\nBecause nvmet_req_init() failed nvmet_pci_epf_complete_iod() is also\ncalled in nvmet_pci_epf_exec_iod_work() leading to a double completion.\nThis not only sends two completions to the host but also corrupts the\nstate of the PCI NVMe target leading to kernel oops.\n\nThis patch lets nvmet_req_init() and req-\u003eexecute() complete all failed\ncommands, and removes the double completion case in\nnvmet_pci_epf_exec_iod_work() therefore fixing the edge cases where\ndouble completions occurred."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-22T16:01:01.651Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a535c0b10060bc8c174a7964b0f98064ee0c4774"
        },
        {
          "url": "https://git.kernel.org/stable/c/746d0ac5a07d5da952ef258dd4d75f0b26c96476"
        }
      ],
      "title": "nvmet: pci-epf: Do not complete commands twice if nvmet_req_init() fails",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38658",
    "datePublished": "2025-08-22T16:01:01.651Z",
    "dateReserved": "2025-04-16T04:51:24.031Z",
    "dateUpdated": "2025-08-22T16:01:01.651Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38658\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:40.907\",\"lastModified\":\"2025-08-22T18:08:51.663\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmet: pci-epf: Do not complete commands twice if nvmet_req_init() fails\\n\\nHave nvmet_req_init() and req-\u003eexecute() complete failed commands.\\n\\nDescription of the problem:\\nnvmet_req_init() calls __nvmet_req_complete() internally upon failure,\\ne.g., unsupported opcode, which calls the \\\"queue_response\\\" callback,\\nthis results in nvmet_pci_epf_queue_response() being called, which will\\ncall nvmet_pci_epf_complete_iod() if data_len is 0 or if dma_dir is\\ndifferent from DMA_TO_DEVICE. This results in a double completion as\\nnvmet_pci_epf_exec_iod_work() also calls nvmet_pci_epf_complete_iod()\\nwhen nvmet_req_init() fails.\\n\\nSteps to reproduce:\\nOn the host send a command with an unsupported opcode with nvme-cli,\\nFor example the admin command \\\"security receive\\\"\\n$ sudo nvme security-recv /dev/nvme0n1 -n1 -x4096\\n\\nThis triggers a double completion as nvmet_req_init() fails and\\nnvmet_pci_epf_queue_response() is called, here iod-\u003edma_dir is still\\nin the default state of \\\"DMA_NONE\\\" as set by default in\\nnvmet_pci_epf_alloc_iod(), so nvmet_pci_epf_complete_iod() is called.\\nBecause nvmet_req_init() failed nvmet_pci_epf_complete_iod() is also\\ncalled in nvmet_pci_epf_exec_iod_work() leading to a double completion.\\nThis not only sends two completions to the host but also corrupts the\\nstate of the PCI NVMe target leading to kernel oops.\\n\\nThis patch lets nvmet_req_init() and req-\u003eexecute() complete all failed\\ncommands, and removes the double completion case in\\nnvmet_pci_epf_exec_iod_work() therefore fixing the edge cases where\\ndouble completions occurred.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/746d0ac5a07d5da952ef258dd4d75f0b26c96476\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a535c0b10060bc8c174a7964b0f98064ee0c4774\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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