CVE-2026-23169 (GCVE-0-2026-23169)
Vulnerability from cvelistv5
Published
2026-02-14 16:01
Modified
2026-08-05 12:20
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() syzbot and Eulgyu Kim reported crashes in mptcp_pm_nl_get_local_id() and/or mptcp_pm_nl_is_backup() Root cause is list_splice_init() in mptcp_pm_nl_flush_addrs_doit() which is not RCU ready. list_splice_init_rcu() can not be called here while holding pernet->lock spinlock. Many thanks to Eulgyu Kim for providing a repro and testing our patches.
References
Impacted products
Vendor Product Version
Linux Linux Version: 141694df6573b49aa4143c92556544b4b0bbda72
Version: 141694df6573b49aa4143c92556544b4b0bbda72
Version: 141694df6573b49aa4143c92556544b4b0bbda72
Version: 141694df6573b49aa4143c92556544b4b0bbda72
Version: 141694df6573b49aa4143c92556544b4b0bbda72
Version: 141694df6573b49aa4143c92556544b4b0bbda72
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix race in mptcp_pm_nl_flush_addrs_doit()\n\nsyzbot and Eulgyu Kim reported crashes in mptcp_pm_nl_get_local_id()\nand/or mptcp_pm_nl_is_backup()\n\nRoot cause is list_splice_init() in mptcp_pm_nl_flush_addrs_doit()\nwhich is not RCU ready.\n\nlist_splice_init_rcu() can not be called here while holding pernet-\u003elock\nspinlock.\n\nMany thanks to Eulgyu Kim for providing a repro and testing our patches."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability requires a local attacker to send a netlink MPTCP_PM_CMD_FLUSH_ADDRS command, which requires CAP_NET_ADMIN (accessible via user namespaces but still local access). The RCU reader side can be triggered by network MPTCP connections, but the flush side requires local netlink access.\nAC:L - The attacker controls both sides of the race \u2014 they can issue the netlink flush command while simultaneously establishing MPTCP connections that trigger RCU list traversal. Since the attacker creates and controls the race condition, complexity is low.\nPR:L - The flush_addrs netlink operation uses GENL_UNS_ADMIN_PERM, which checks CAP_NET_ADMIN in the user namespace via netlink_ns_capable(). An unprivileged user can obtain this capability through user namespaces (unshare -Urn).\nUI:N - No user interaction is required. The attacker can trigger both the netlink flush and the MPTCP connection processing independently without any victim action.\nS:U - The vulnerability exists within the kernel and impacts the same security context. There is no crossing of a virtualization or sandbox boundary.\nC:H - This is a use-after-free / list corruption bug where RCU readers access freed mptcp_pm_addr_entry structures. UAF gives the attacker control over freed object contents via heap spraying, enabling arbitrary kernel memory reads.\nI:H - The use-after-free on mptcp_pm_addr_entry structures (which contain function-relevant pointers and a socket pointer) can be exploited via heap spraying to achieve arbitrary write primitives and potentially control flow hijacking.\nA:H - The corrupted list pointers and use-after-free reliably cause kernel crashes (oops/panic) as reported by syzbot, providing a straightforward denial-of-service vector."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:20:24.946Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/338d40bab283da2639780ee3e458fb61f1567d8c"
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        {
          "url": "https://git.kernel.org/stable/c/7896dbe990d56d5bb8097863b2645355633665eb"
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          "url": "https://git.kernel.org/stable/c/455e882192c9833f176f3fbbbb2f036b6c5bf555"
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        {
          "url": "https://git.kernel.org/stable/c/51223bdd0f60b06cfc7f25885c4d4be917adba94"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f1b9523527df02685dde603f20ff6e603d8e4a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/e2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1d"
        }
      ],
      "title": "mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23169",
    "datePublished": "2026-02-14T16:01:32.139Z",
    "dateReserved": "2026-01-13T15:37:45.982Z",
    "dateUpdated": "2026-08-05T12:20:24.946Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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