{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74666",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74666"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "packet: synchronize pressure clearing with ring reconfiguration",
  "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->prot_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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74666"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf3c8e86bc8ad111be3f3136125e255344bcb3da"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8cfb2e71926a682f36c4240067d424074dd8f70f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f015c9de92b731814059a343b765c60c0196225c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-27T12:40:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is hit only from local AF_PACKET syscalls\u2014setsockopt(PACKET_RX_RING) racing poll(2)/recvmsg(2) pressure clearing in packet_poll()/packet_recvmsg()\u2014not from remote packet receive paths like ksmbd, nfsd, or the TCP/IP stack.\nAC:L - The attacker controls both race sides: one thread polls/recvmsg while PACKET_SOCK_PRESSURE is set, another tears down the RX ring via PACKET_RX_RING; packet_set_ring()'s synchronize_net() window makes the stale tpacket_rcv vs NULL/freed pg_vec mismatch reliably winnable.\nPR:L - packet_create() requires ns_capable(net->user_ns, CAP_NET_RAW); unprivileged users obtain CAP_NET_RAW via user+network namespaces (unshare -Urn) or container defaults (Docker NET_RAW), without init-namespace root.\nUI:N - No victim action is required; the attacker creates the AF_PACKET socket, configures the mmap RX ring, fills it to set PACKET_SOCK_PRESSURE, and races ring teardown against its own poll/recvmsg calls.\nS:U - Stale/NULL ring dereferences corrupt kernel heap state on the same host; this is standard kernel memory corruption within one security authority, not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - __packet_rcv_has_room() follows tpacket_rcv and dereferences rb->pg_vec or prb_bdqc block pointers after packet_set_ring() cleared/freed the ring, yielding NULL-dereference or use-after-free reads of ring metadata and mmap-backed pages.\nI:H - Freed ring storage and stale prb_bdqc/pkbdq pointers remain attacker-influenced through mmap and concurrent ring operations, providing a controllable kernel heap use-after-free write primitive typical of AF_PACKET ring reconfiguration races.\nA:H - NULL pg_vec indexing in packet_lookup_frame() or stale block access in prb_lookup_block() from the pressure-clearing path causes an immediate kernel oops/panic, giving any qualifying local attacker repeatable host-wide denial of service."
    }
  }
}