{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bd61848900bff597764238f3a8ec67c815cd316e"
            },
            {
              "fixed": "2151b2bcf6fcec52665f606eed20da068447f0b7"
            },
            {
              "fixed": "b04326c7927af7048fd4e730f5770cca350d0a60"
            },
            {
              "fixed": "125755776bc6d4dd53eaf551c87e3d460625d638"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.16.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90051.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: reject non zerocopy devmem tx\n\nDevmem tcp tx doesn't work without zero-copy, however it's not currently\nenforced if NETIF_F_SG isn't present. In this case, tcp_sendmsg_locked()\nwill try the copy path and try to copy data from an iovec which consists\nof offsets into the dma-buf and would normally fail. Moreover,\nd9c56501c72fd (\"net: tcp: block mixing readable and unreadable frags\")\nrelies on that and assumes that the devmem binding is present IFF we're\nusing the zero-copy path, which can be used to mix net-iov and pages in\na single skb, and break invariants. Let's reject devmem tx without\nzero-copy.\n\nNote, the parameter check the patch is modifying is too loose, we can\ncreate an io_uring request with dmabuf_id and all ZC flags, but which\nwon't have the binding. We replace it with stricter validation.",
  "id": "CVE-2026-90051",
  "modified": "2026-09-19T03:30:17.822834761Z",
  "published": "2026-09-17T16:05:37.620Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/125755776bc6d4dd53eaf551c87e3d460625d638"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2151b2bcf6fcec52665f606eed20da068447f0b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b04326c7927af7048fd4e730f5770cca350d0a60"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90051.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90051"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tcp: reject non zerocopy devmem tx"
}