{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3b3009ea8abb713b022d94fba95ec270cf6e7eae"
            },
            {
              "fixed": "25fb53e43ec006ac69b9e825a7e8a11d63a6083e"
            },
            {
              "fixed": "b6557f912509abe8e70223373dd7a44d1d4a0d6c"
            },
            {
              "fixed": "67cec2f1eb9e58719d622e92e2278ceda72dbd85"
            },
            {
              "fixed": "4dafc411948469277b276724c3b2b4408c02c04c"
            },
            {
              "fixed": "81246a65303d9635266b1334490142caaf86a11f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.4.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74270.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhandshake: Require admin permission for DONE command\n\nACCEPT and DONE are the two downcalls of the handshake genl\nfamily, both intended for use by the trusted handshake agent\n(tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has\nno privilege check at all.\n\nThe fd-lookup in handshake_nl_done_doit() only confirms that\nsome pending handshake request exists for the supplied sockfd;\nit does not authenticate the sender. An unprivileged process\nthat guesses or observes a valid sockfd can therefore submit\na DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel\nconsumer to proceed as if the handshake succeeded. A non-zero\nstatus on a forged DONE tears down a legitimate in-flight\nhandshake before tlshd can report its real result.",
  "id": "CVE-2026-74270",
  "modified": "2026-08-18T03:30:50.921610510Z",
  "published": "2026-08-15T05:57:44.195Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25fb53e43ec006ac69b9e825a7e8a11d63a6083e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4dafc411948469277b276724c3b2b4408c02c04c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67cec2f1eb9e58719d622e92e2278ceda72dbd85"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81246a65303d9635266b1334490142caaf86a11f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6557f912509abe8e70223373dd7a44d1d4a0d6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74270.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74270"
    },
    {
      "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": "handshake: Require admin permission for DONE command"
}