{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3f2304f8c6d6ed97849057bd16fee99e434ca796"
            },
            {
              "fixed": "49a4dcf57608ebf6432dbcb203ed25e7ed581445"
            },
            {
              "fixed": "bc4013c7cce58d46f792c8c87bc8c8318a70190e"
            },
            {
              "fixed": "a4c3c7310156493797c920b10d8648c07aa05403"
            },
            {
              "fixed": "3b3d27670c0c890ba7cf1bc3614cab61bde6d25c"
            },
            {
              "fixed": "3a0b05145053a5fad1a2ddb4e4d87b07385e63e5"
            },
            {
              "fixed": "6efbc52237facda35d2d874fe1765bb4839275d8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89481.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: fix host memory disclosure on R2T for a read command\n\nnvme_tcp_handle_r2t() does not check the direction of the request the\nR2T refers to. A malicious controller can send an R2T for a READ and\nthe host will answer it: nvme_tcp_setup_h2c_data_pdu() builds the\nH2CData header and nvme_tcp_try_send_data() sends the request's data\nbuffer. That buffer is the READ destination, so its contents go to the\ncontroller.\n\nThe command then completes normally and nothing is logged.\n\nAgainst a test controller that answers every READ with an R2T, a 4096\nbyte buffered read returned all 4096 bytes, split over two R2Ts. The\npages contained stale kernel data, including an array of struct page\npointers.\n\nReject an R2T for a request that is not a write.",
  "id": "CVE-2026-89481",
  "modified": "2026-09-15T03:30:47.070304809Z",
  "published": "2026-09-11T19:43:36.589Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a0b05145053a5fad1a2ddb4e4d87b07385e63e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b3d27670c0c890ba7cf1bc3614cab61bde6d25c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49a4dcf57608ebf6432dbcb203ed25e7ed581445"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6efbc52237facda35d2d874fe1765bb4839275d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4c3c7310156493797c920b10d8648c07aa05403"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc4013c7cce58d46f792c8c87bc8c8318a70190e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89481.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89481"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nvme-tcp: fix host memory disclosure on R2T for a read command"
}