{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "dc99f600698dcac69b8f56dda9a8a00d645c5ffc"
            },
            {
              "fixed": "80ec024d53a05c60ad1d08968dcf745f10c1665c"
            },
            {
              "fixed": "0a052e0808e015e68144a9877e6ef42b952c49fa"
            },
            {
              "fixed": "1bc55c29cd85818e9052f17deb287d5a11fb817f"
            },
            {
              "fixed": "a885387dae7986a55bae5c77a15bdd447f64e9b9"
            },
            {
              "fixed": "50aff80475abd3533eef4320477037e6fcc6b56e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68338.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: avoid fanout hook re-registration after unregister\n\npacket_set_ring() temporarily detaches a socket from packet delivery while\nreconfiguring its ring. It records the previous running state, clears\npo-\u003enum, unregisters the protocol hook when needed, drops po-\u003ebind_lock,\nand later restores po-\u003enum and re-registers the hook from the saved\nwas_running value.\n\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\nobserve the socket as not running, skip __unregister_prot_hook(), and\ninvalidate the per-socket binding by setting po-\u003eifindex to -1 and clearing\npo-\u003eprot_hook.dev. A one-member fanout group can still retain its shared\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\nsolely from the stale was_running state can re-add the fanout hook after\nthe device has been unregistered.\n\nTreat po-\u003eifindex == -1 as an invalidated binding after reacquiring\npo-\u003ebind_lock. This is distinct from ifindex 0, the normal\nunbound/wildcard state: ifindex -1 marks an existing device binding that\nwas invalidated when the device was unregistered. Restore po-\u003enum as\nbefore, but do not re-register the hook if device unregister already\ndetached the socket.",
  "id": "CVE-2026-68338",
  "modified": "2026-08-18T03:31:14.741478125Z",
  "published": "2026-08-10T12:03:14.549Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1bc55c29cd85818e9052f17deb287d5a11fb817f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50aff80475abd3533eef4320477037e6fcc6b56e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80ec024d53a05c60ad1d08968dcf745f10c1665c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a885387dae7986a55bae5c77a15bdd447f64e9b9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68338.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68338"
    },
    {
      "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": "net/packet: avoid fanout hook re-registration after unregister"
}