mptcp: fix possible deadlock in subflow diag

{
  "id": "35a49a9fa9915771516302217a67e3484a1bd50686ba684bb1731312e94d5eb7",
  "url": "https://osv.dev/vulnerability/CVE-2024-26781",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: fix possible deadlock in subflow diag",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mptcp: fix possible deadlock in subflow diag Syzbot and Eric reported a lockdep splat in the subflow diag: WARNING: possible circular locking dependency detected 6.8.0-rc4-syzkaller-00212-g40b9385dd8e6 #0 Not tainted syz-executor.2/24141 is trying to acquire lock: ffff888045870130 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_diag_put_ulp net/ipv4/tcp_diag.c:100 [inline] ffff888045870130 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_diag_get_aux+0x738/0x830 net/ipv4/tcp_diag.c:137 but task is already holding lock: ffffc9000135e488 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] ffffc9000135e488 (&h->lhash2[i].lock){+.+.}-{2:2}, at: inet_diag_dump_icsk+0x39f/0x1f80 net/ipv4/inet_diag.c:1038 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&h->lhash2[i].lock){+.+.}-{2:2}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __inet_hash+0x335/0xbe0 net/ipv4/inet_hashtables.c:743 inet_csk_listen_start+0x23a/0x320 net/ipv4/inet_connection_sock.c:1261 __inet_listen_sk+0x2a2/0x770 net/ipv4/af_inet.c:217 inet_listen+0xa3/0x110 net/ipv4/af_inet.c:239 rds_tcp_listen_init+0x3fd/0x5a0 net/rds/tcp_listen.c:316 rds_tcp_init_net+0x141/0x320 net/rds/tcp.c:577 ops_init+0x352/0x6",
    "evidence": "osv:CVE-2024-26781",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "5.15.151",
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-26781",
      "aliases": [
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          "versions": [
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            "v5.15.150",
            "v6.1.80",
            "v6.6.20",
            "v6.6.19",
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:47.803941471Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/70e5b013538d5e4cb421afed431a5fcd2a5d49ee",
        "https://git.kernel.org/stable/c/cc32ba2fdf3f8b136619fff551f166ba51ec856d",
        "https://git.kernel.org/stable/c/d487e7ba1bc7444d5f062c4930ef8436c47c7e63",
        "https://git.kernel.org/stable/c/d6a9608af9a75d13243d217f6ce1e30e57d56ffe",
        "https://git.kernel.org/stable/c/f27d319df055629480b84b9288a502337b6f2a2e",
        "https://git.kernel.org/stable/c/fa8c776f4c323a9fbc8ddf25edcb962083391430",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26781.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26781",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26781.json"
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    "related_cves": [
      {
        "value": "CVE-2024-26781",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 515846,
  "published_at": "2024-04-04T08:20:15.775+00:00"
}