{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68161",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68161"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "sctp: close UDP tunnel sockets during netns teardown",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: close UDP tunnel sockets during netns teardown\n\nproc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when\nnet.sctp.udp_port is set, and stops/restarts them when the sysctl value\nchanges. The netns exit path does not stop these sockets, so a namespace\ncan be torn down while its SCTP UDP tunnel sockets are still installed.\n\nClose the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering\nthe per-net sysctl table. This prevents new sysctl writes from racing in\nwhile the sockets are being released, and closes the sockets before the\ncontrol socket is destroyed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.42"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68161"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c29affd44e6769e3073235d4b471d9b501fa8166"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c6eb2d615210b80339548ab07c0230edaab9a6c7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ff78591d309c50a4fdab683b68dd8d512a270dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3bf0e349cbb4f975f35eb22753acc346b89c66a0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/37ff9794be48d0caa37687e04d09675f9c849121"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ffb2bd7ade36ec4da32c46a6eddbf4515316d08c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Stale SCTP UDP tunnel sockets left installed after netns teardown still receive remote SCTP-over-UDP (RFC 6951) on the configured net.sctp.udp_port; packets enter sctp_udp_rcv\u2192sctp_rcv in softirq and touch freed per-net SCTP/UDP state.\nAC:L - An attacker can repeatedly race namespace deletion against SCTP-over-UDP traffic they send or receive, controlling both teardown timing and packet delivery; no attacker-uncontrollable memory layout or rare kernel config is required beyond SCTP being enabled.\nPR:N - On SCTP-over-UDP deployments where net.sctp.udp_port is already configured, any remote SCTP peer needs no credentials on the target; alternatively an unprivileged local user obtains CAP_NET_ADMIN via user namespaces to set udp_port and destroy the namespace.\nUI:N - Exploitation requires only attacker-driven SCTP-over-UDP traffic and namespace lifecycle events (e.g., container restart); no victim must mount a filesystem, open a file, or take any separate interactive action.\nS:U - Impact is host-kernel slab use-after-free and memory corruption within the same OS security authority; it does not cross VM, IOMMU, or sandbox boundaries to affect a separate security domain.\nC:H - Use-after-free of struct net and SCTP UDP tunnel socket state lets an attacker influence freed slab contents and obtain arbitrary kernel memory read primitives through subsequent SCTP/UDP lookups and socket processing.\nI:H - The UAF enables heap grooming and reuse of freed per-net/socket objects in SCTP/UDP handlers, supporting arbitrary kernel writes and control-flow hijack typical of slab use-after-free exploitation.\nA:H - Dereferencing SCTP/UDP tunnel sockets and per-net state after netns free causes slab use-after-free detections, kernel oops, or panic; even unexploited UAF commonly crashes or hangs the host."
    }
  }
}