{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3f2304f8c6d6ed97849057bd16fee99e434ca796"
            },
            {
              "fixed": "df74950ba6008655d4a977d17df7faf4b6e52b74"
            },
            {
              "fixed": "980d990f3c0560d7dfbfbf14699651fdf02f26ee"
            },
            {
              "fixed": "5b115d932f6e769ac80783fb18edd21b0aed256e"
            },
            {
              "fixed": "0673a2affe45ca76b60de31a83c67b1e60f81bde"
            },
            {
              "fixed": "80d56202fbdff8906be6954b2776e5c14a4026f2"
            },
            {
              "fixed": "b4af7999a998787d5eb6facb5a333e04a4f1d2d9"
            },
            {
              "fixed": "a0c389b8a495bda1eb719d2503853c924b7a8355"
            },
            {
              "fixed": "f83af377c148f6ad94b41c0e8313f12adf45e1c1"
            }
          ],
          "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": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89973.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read.  A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i-\u003edata_source) and returns 0.  The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption.  What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names.  The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n  [    6.885580] ------------[ cut here ]------------\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n  [    6.903739] Call Trace:\n  [    6.904085]  \u003cTASK\u003e\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\n  [    6.926906]  \u003c/TASK\u003e\n  [    6.927226] ---[ end trace 0000000000000000 ]---\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n  [    6.928709] nvme nvme0: receive failed:  -14",
  "id": "CVE-2026-89973",
  "modified": "2026-09-17T03:30:21.522387819Z",
  "published": "2026-09-16T10:32:52.409Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89973.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89973"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nvme-tcp: check the data direction of a C2HData PDU"
}