{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b6a0ca11186759ad7045d68a5447b1e89f658384"
            },
            {
              "fixed": "9858c91d9ee6a13c45311569039413729fc9b757"
            },
            {
              "fixed": "1226293ec9bed3d4cc5b05eeeb811d315ca51652"
            },
            {
              "fixed": "3750f75f29f99c0223601e2ee73ad084adec47bd"
            },
            {
              "fixed": "d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97"
            },
            {
              "fixed": "0025276175fbbe0dcbf3f84d090b0adee769e9d9"
            },
            {
              "fixed": "347b59e9f96719d89b6ef555d02a18ada1a5846f"
            },
            {
              "fixed": "0443e4416aa1ee97748d1ed904eaf3352c60045e"
            },
            {
              "fixed": "c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.7.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64331.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: vudc: fix NULL deref in vep_dequeue()\n\nvep_alloc_request() wasn't initializing vrequest-\u003eudc, so cancellations\non the FunctionFS AIO path were arriving in vep_dequeue without a valid\nUDC reference.\n\nSince vrequest-\u003eudc is never actually properly used anywhere, we opt to\nremove it, and update vep_dequeue to obtain a reference to the udc with\nep_to_vudc(), consistent with the other vep_ ops.\n\nAFAICT this bug has existed for ~10 years. Seems that nobody has really\nstressed the FunctionFS AIO path on usbip's vudc.\n\nI tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints\nvia AIO. Before the fix, running `usbip attach` from the host would\ncause the guest to oops with the following backtrace:\n\nCall trace:\n vep_dequeue+0x1c/0xe4 (P)\n usb_ep_dequeue+0x14/0x20\n ffs_aio_cancel+0x24/0x34\n __arm64_sys_io_cancel+0xb0/0x124\n do_el0_svc+0x68/0x100\n el0_svc+0x18/0x5c\n el0t_64_sync_handler+0x98/0xdc\n el0t_64_sync+0x154/0x158",
  "id": "CVE-2026-64331",
  "modified": "2026-07-27T03:56:44.333562512Z",
  "published": "2026-07-25T08:49:58.370Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64331.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64331"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "usbip: vudc: fix NULL deref in vep_dequeue()"
}