{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a"
            },
            {
              "fixed": "cf8189b82bb93f219ab740e0346c919ad65ada62"
            },
            {
              "fixed": "ad740b4990347521f0db260d381f9f74e7b340ba"
            },
            {
              "fixed": "2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"
            },
            {
              "fixed": "a08196c3cc105947746ec21309edfbb60275fcdb"
            },
            {
              "fixed": "1a35da325cac4d5bcad76a2aa943408a6f1d9000"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.2.0"
            },
            {
              "fixed": "6.6.152"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.104"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74666.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: synchronize pressure clearing with ring reconfiguration\n\npacket_set_ring() updates the RX ring state under sk_receive_queue.lock,\nbut used to publish the tpacket receive mode through po-\u003eprot_hook.func\nafter releasing that lock. packet_poll() and packet_recvmsg() can then\nrun the pressure clearing path after the ring has been cleared while\nstill seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference\nstale or NULL ring storage.\n\nMove the existing receive hook assignment into the same\nsk_receive_queue.lock section as the ring state update. Keep the\nassignment otherwise unchanged, including on TX ring reconfiguration, to\navoid adding behavior changes that are not required for the fix.\n\nSerialize packet_recvmsg() pressure clearing with the same queue lock\nonly after PACKET_SOCK_PRESSURE has been observed. If the flag is clear\nand the socket has moved away from tpacket_rcv, packet_set_ring() has\nalready detached the socket and waited for synchronize_net(), so no new\npacket input can set the flag again.\n\npacket_poll() already holds sk_receive_queue.lock, so it uses the new\nunlocked helper directly.",
  "id": "CVE-2026-74666",
  "modified": "2026-08-24T11:36:08.442157073Z",
  "published": "2026-08-22T15:32:38.098Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74666.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74666"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "packet: synchronize pressure clearing with ring reconfiguration"
}