CVE-2026-98964 (GCVE-0-2026-98964)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:19 – Updated: 2026-10-24 14:09
VLAI
Title
nvmet: use the local P2P device on metadata allocation failure
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: use the local P2P device on metadata allocation failure nvmet_req_alloc_p2pmem_sgls() assigns req->p2p_dev only after the data and metadata SGL allocations succeed. If the data allocation succeeds but the metadata allocation fails, out_free_sg passes req->p2p_dev to pci_p2pmem_free_sgl() before that assignment has taken place. Pass the local p2p_dev argument instead, so cleanup uses the same PCI device as the successful data allocation.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bcd9a0797d73eeff659582f23277e7ab6e5f18f3 , < 3c231142c4f4bb96836469eb276026ec55940093 (git)
Affected: bcd9a0797d73eeff659582f23277e7ab6e5f18f3 , < 32f21607911a1f69c8f0f93a6c28fe6f8490aa98 (git)
Affected: bcd9a0797d73eeff659582f23277e7ab6e5f18f3 , < ce79a6c5cc1b8054ec8d3eba16adda4a36113438 (git)
Affected: bcd9a0797d73eeff659582f23277e7ab6e5f18f3 , < 73bf0f9579633b531098a475e6e55c9316763aed (git)
Affected: bcd9a0797d73eeff659582f23277e7ab6e5f18f3 , < 4aa9c0f377a4de5e8fddce76b34ee4529639a1ff (git)
Affected: c440cd080761b18a52cac20f2a42e5da1e3995af (git)
Affected: 8a452d62e7cea3c8a2676a3b89a9118755a1a271 (git)
Affected: 5.10.43 , < 5.11 (semver)
Affected: 5.12.10 , < 5.13 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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              "version": "6.12.113",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "5.13",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: use the local P2P device on metadata allocation failure\n\nnvmet_req_alloc_p2pmem_sgls() assigns req-\u003ep2p_dev only after the data\nand metadata SGL allocations succeed. If the data allocation succeeds\nbut the metadata allocation fails, out_free_sg passes req-\u003ep2p_dev to\npci_p2pmem_free_sgl() before that assignment has taken place.\n\nPass the local p2p_dev argument instead, so cleanup uses the same PCI\ndevice as the successful data allocation."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - An NVMe/RDMA I/O capsule received by nvmet_rdma_recv_done() supplies the keyed-SGL length and RW NLB; nvmet_rdma_handle_command() -\u003e nvmet_req_init() -\u003e nvmet_bdev_parse_io_cmd() -\u003e nvmet_rdma_map_sgl_keyed() -\u003e nvmet_req_alloc_sgls() reaches patched nvmet_req_alloc_p2pmem_sgls(). The RDMA_PS_TCP listener binds IPv4/IPv6, so it is network-reachable.\nAC:L - On a P2P/PI-enabled target, nvmet_bdev_parse_io_cmd() derives metadata_len from cmd-\u003erw.length, while nvmet_rdma_map_sgl_keyed() copies the capsule\u0027s SGL length into transfer_len. The peer can use chosen lengths and concurrent requests to consume the finite P2P pool until data allocation succeeds and metadata allocation fails, without an uncontrolled race.\nPR:N - nvmet_alloc_ctrl() accepts a peer through nvmet_host_allowed() when allow_any_host is set; nvmet_setup_auth() then skips DH-HMAC-CHAP, and nvmet_check_auth_status() permits I/O. The remote initiator therefore needs no credential or local privilege.\nUI:N - After the target is listening, the peer alone establishes its queues and sends metadata I/O capsules handled by nvmet_rdma_recv_done(); no victim action is needed to reach nvmet_req_alloc_p2pmem_sgls().\nS:U - nvmet_req_alloc_p2pmem_sgls() faults while freeing target-kernel memory; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - nvmet_rdma_rsp storage is zero-initialized and normal nvmet_req_free_sgls() clears req-\u003ep2p_dev; on metadata failure, nvmet_req_alloc_p2pmem_sgls() passes that still-NULL field to pci_p2pmem_free_sgl(). The resulting NULL dereference exposes no memory.\nI:N - pci_free_p2pmem() faults while evaluating pdev-\u003ep2pdma with pdev equal to NULL, before gen_pool_free_owner() can alter the pool. This is not an out-of-bounds write, use-after-free, or other attacker-controlled modification primitive.\nA:H - nvmet_req_alloc_p2pmem_sgls() invokes pci_p2pmem_free_sgl() with a NULL device when the controlled data-success/metadata-failure split occurs; pci_free_p2pmem() then causes a kernel NULL-pointer oops or panic, taking down the target host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:40.850Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c231142c4f4bb96836469eb276026ec55940093"
        },
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          "url": "https://git.kernel.org/stable/c/32f21607911a1f69c8f0f93a6c28fe6f8490aa98"
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        {
          "url": "https://git.kernel.org/stable/c/4aa9c0f377a4de5e8fddce76b34ee4529639a1ff"
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      "title": "nvmet: use the local P2P device on metadata allocation failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98964",
    "datePublished": "2026-10-23T12:19:32.374Z",
    "dateReserved": "2026-09-25T10:25:14.383Z",
    "dateUpdated": "2026-10-24T14:09:40.850Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "date": "2026-10-26",
      "epss": "0.00538",
      "percentile": "0.45052"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-98964",
      "id": "msrc_CVE-2026-98964",
      "initial_release_date": "2026-10-24T01:10:06.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nvmet: use the local P2P device on metadata allocation failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98964.json",
      "version": "3"
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    "nvd": {
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: use the local P2P device on metadata allocation failure\n\nnvmet_req_alloc_p2pmem_sgls() assigns req-\u003ep2p_dev only after the data\nand metadata SGL allocations succeed. If the data allocation succeeds\nbut the metadata allocation fails, out_free_sg passes req-\u003ep2p_dev to\npci_p2pmem_free_sgl() before that assignment has taken place.\n\nPass the local p2p_dev argument instead, so cleanup uses the same PCI\ndevice as the successful data allocation."
          }
        ],
        "id": "CVE-2026-98964",
        "lastModified": "2026-10-24T14:16:49.490",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-23T13:17:17.830",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/32f21607911a1f69c8f0f93a6c28fe6f8490aa98"
          },
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            "url": "https://git.kernel.org/stable/c/73bf0f9579633b531098a475e6e55c9316763aed"
          },
          {
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            "url": "https://git.kernel.org/stable/c/ce79a6c5cc1b8054ec8d3eba16adda4a36113438"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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