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CVE-2026-80787 (GCVE-0-2026-80787)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12
VLAI
Title
nvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work()
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work() nvmet_pci_epf_exec_iod_work() submits an I/O command with req->execute() and then waits for the command to complete and transfers the data back to the host. This wait is not needed for commands that do not transfer data from the device to the host. To decide whether that wait is needed, it reads iod->data_len and iod->dma_dir after calling req->execute(). However, once req->execute() is called, the command may complete asynchronously on another CPU. For commands that do not require a device-to-host data transfer, nvmet_pci_epf_queue_response() calls nvmet_pci_epf_complete_iod() directly, which can free the iod before it reads iod->data_len and iod->dma_dir, resulting in the KFENCE use-after- free: BUG: KFENCE: use-after-free read in nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf] Use-after-free read at 0x00000000fdfa6d03 (in kfence-#63): nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf] process_one_work+0x15c/0x4f0 worker_thread+0x18c/0x30c kthread+0x130/0x140 ret_from_fork+0x10/0x20 kfence-#63: 0x00000000e3de0e71-0x00000000c938ad62, size=712, cache=kmalloc-1k allocated by task 10 on cpu 0 at 73.995480s (0.005122s ago): mempool_kmalloc+0x1c/0x28 mempool_alloc_noprof+0x40/0x9c nvmet_pci_epf_poll_sqs_work+0xd4/0x344 [nvmet_pci_epf] process_one_work+0x15c/0x4f0 worker_thread+0x18c/0x30c kthread+0x130/0x140 ret_from_fork+0x10/0x20 freed by task 131 on cpu 3 at 73.995521s (0.008385s ago): mempool_kfree+0x10/0x20 mempool_free+0x44/0x64 nvmet_pci_epf_free_iod+0x88/0x98 [nvmet_pci_epf] nvmet_pci_epf_cq_work+0xfc/0x280 [nvmet_pci_epf] process_one_work+0x15c/0x4f0 worker_thread+0x18c/0x30c kthread+0x130/0x140 ret_from_fork+0x10/0x20 Fix this by referring to iod->data_len and iod->dma_dir before calling req->execute(). The remaining iod accesses such as iod->status are only reached on the device-to-host read path. In this case, nvmet_pci_epf_queue_response() signals iod->done instead of freeing the iod, so the iod stays valid.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 20be486d1c225402b067391e72ff5b0dd8ebff76 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 1ed1eeaef55cebf2d74b3ef104c20bdab719b165 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < cede8d2852570c79b9bbb9527255ae9ed3317b82 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < c9e9bb757971485b4e8414b1744507af186d72c9 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/pci-epf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
              "version": "0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/pci-epf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.47",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.11",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work()\n\nnvmet_pci_epf_exec_iod_work() submits an I/O command with req-\u003eexecute()\nand then waits for the command to complete and transfers the data back\nto the host. This wait is not needed for commands that do not transfer\ndata from the device to the host. To decide whether that wait is needed,\nit reads iod-\u003edata_len and iod-\u003edma_dir after calling req-\u003eexecute().\n\nHowever, once req-\u003eexecute() is called, the command may complete\nasynchronously on another CPU. For commands that do not require a\ndevice-to-host data transfer, nvmet_pci_epf_queue_response() calls\nnvmet_pci_epf_complete_iod() directly, which can free the iod before it\nreads iod-\u003edata_len and iod-\u003edma_dir, resulting in the KFENCE use-after-\nfree:\n\n BUG: KFENCE: use-after-free read in nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]\n\n Use-after-free read at 0x00000000fdfa6d03 (in kfence-#63):\n  nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]\n  process_one_work+0x15c/0x4f0\n  worker_thread+0x18c/0x30c\n  kthread+0x130/0x140\n  ret_from_fork+0x10/0x20\n\n kfence-#63: 0x00000000e3de0e71-0x00000000c938ad62, size=712, cache=kmalloc-1k\n\n allocated by task 10 on cpu 0 at 73.995480s (0.005122s ago):\n  mempool_kmalloc+0x1c/0x28\n  mempool_alloc_noprof+0x40/0x9c\n  nvmet_pci_epf_poll_sqs_work+0xd4/0x344 [nvmet_pci_epf]\n  process_one_work+0x15c/0x4f0\n  worker_thread+0x18c/0x30c\n  kthread+0x130/0x140\n  ret_from_fork+0x10/0x20\n\n freed by task 131 on cpu 3 at 73.995521s (0.008385s ago):\n  mempool_kfree+0x10/0x20\n  mempool_free+0x44/0x64\n  nvmet_pci_epf_free_iod+0x88/0x98 [nvmet_pci_epf]\n  nvmet_pci_epf_cq_work+0xfc/0x280 [nvmet_pci_epf]\n  process_one_work+0x15c/0x4f0\n  worker_thread+0x18c/0x30c\n  kthread+0x130/0x140\n  ret_from_fork+0x10/0x20\n\nFix this by referring to iod-\u003edata_len and iod-\u003edma_dir before calling\nreq-\u003eexecute(). The remaining iod accesses such as iod-\u003estatus are only\nreached on the device-to-host read path. In this case,\nnvmet_pci_epf_queue_response() signals iod-\u003edone instead of freeing the\niod, so the iod stays valid."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:12:58.796Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/20be486d1c225402b067391e72ff5b0dd8ebff76"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ed1eeaef55cebf2d74b3ef104c20bdab719b165"
        },
        {
          "url": "https://git.kernel.org/stable/c/cede8d2852570c79b9bbb9527255ae9ed3317b82"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9e9bb757971485b4e8414b1744507af186d72c9"
        }
      ],
      "title": "nvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80787",
    "datePublished": "2026-09-04T15:12:58.796Z",
    "dateReserved": "2026-08-26T14:34:25.793Z",
    "dateUpdated": "2026-09-04T15:12:58.796Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80787",
      "date": "2026-09-15",
      "epss": "0.00168",
      "percentile": "0.06365"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80787\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:04.710\",\"lastModified\":\"2026-09-04T16:18:04.710\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work()\\n\\nnvmet_pci_epf_exec_iod_work() submits an I/O command with req-\u003eexecute()\\nand then waits for the command to complete and transfers the data back\\nto the host. This wait is not needed for commands that do not transfer\\ndata from the device to the host. To decide whether that wait is needed,\\nit reads iod-\u003edata_len and iod-\u003edma_dir after calling req-\u003eexecute().\\n\\nHowever, once req-\u003eexecute() is called, the command may complete\\nasynchronously on another CPU. For commands that do not require a\\ndevice-to-host data transfer, nvmet_pci_epf_queue_response() calls\\nnvmet_pci_epf_complete_iod() directly, which can free the iod before it\\nreads iod-\u003edata_len and iod-\u003edma_dir, resulting in the KFENCE use-after-\\nfree:\\n\\n BUG: KFENCE: use-after-free read in nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]\\n\\n Use-after-free read at 0x00000000fdfa6d03 (in kfence-#63):\\n  nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]\\n  process_one_work+0x15c/0x4f0\\n  worker_thread+0x18c/0x30c\\n  kthread+0x130/0x140\\n  ret_from_fork+0x10/0x20\\n\\n kfence-#63: 0x00000000e3de0e71-0x00000000c938ad62, size=712, cache=kmalloc-1k\\n\\n allocated by task 10 on cpu 0 at 73.995480s (0.005122s ago):\\n  mempool_kmalloc+0x1c/0x28\\n  mempool_alloc_noprof+0x40/0x9c\\n  nvmet_pci_epf_poll_sqs_work+0xd4/0x344 [nvmet_pci_epf]\\n  process_one_work+0x15c/0x4f0\\n  worker_thread+0x18c/0x30c\\n  kthread+0x130/0x140\\n  ret_from_fork+0x10/0x20\\n\\n freed by task 131 on cpu 3 at 73.995521s (0.008385s ago):\\n  mempool_kfree+0x10/0x20\\n  mempool_free+0x44/0x64\\n  nvmet_pci_epf_free_iod+0x88/0x98 [nvmet_pci_epf]\\n  nvmet_pci_epf_cq_work+0xfc/0x280 [nvmet_pci_epf]\\n  process_one_work+0x15c/0x4f0\\n  worker_thread+0x18c/0x30c\\n  kthread+0x130/0x140\\n  ret_from_fork+0x10/0x20\\n\\nFix this by referring to iod-\u003edata_len and iod-\u003edma_dir before calling\\nreq-\u003eexecute(). The remaining iod accesses such as iod-\u003estatus are only\\nreached on the device-to-host read path. In this case,\\nnvmet_pci_epf_queue_response() signals iod-\u003edone instead of freeing the\\niod, so the iod stays valid.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nvme/target/pci-epf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186\",\"lessThan\":\"20be486d1c225402b067391e72ff5b0dd8ebff76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186\",\"lessThan\":\"1ed1eeaef55cebf2d74b3ef104c20bdab719b165\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186\",\"lessThan\":\"cede8d2852570c79b9bbb9527255ae9ed3317b82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186\",\"lessThan\":\"c9e9bb757971485b4e8414b1744507af186d72c9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nvme/target/pci-epf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ed1eeaef55cebf2d74b3ef104c20bdab719b165\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20be486d1c225402b067391e72ff5b0dd8ebff76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9e9bb757971485b4e8414b1744507af186d72c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cede8d2852570c79b9bbb9527255ae9ed3317b82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:51:44Z",
      "cve": "CVE-2026-80787",
      "id": "CVE-2026-80787",
      "initial_release_date": "2026-09-05T00:27:25Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "324",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80787",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80787.json",
      "version": "5"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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