mptcp: fix UaF in listener shutdown

{
  "id": "65ebf32ef0a10512501a93be66d26f2cf08b967b456bd3da942ca5973567b93d",
  "url": "https://osv.dev/vulnerability/CVE-2023-53088",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: fix UaF in listener shutdown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mptcp: fix UaF in listener shutdown As reported by Christoph after having refactored the passive socket initialization, the mptcp listener shutdown path is prone to an UaF issue. BUG: KASAN: use-after-free in _raw_spin_lock_bh+0x73/0xe0 Write of size 4 at addr ffff88810cb23098 by task syz-executor731/1266 CPU: 1 PID: 1266 Comm: syz-executor731 Not tainted 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x6e/0x91 print_report+0x16a/0x46f kasan_report+0xad/0x130 kasan_check_range+0x14a/0x1a0 _raw_spin_lock_bh+0x73/0xe0 subflow_error_report+0x6d/0x110 sk_error_report+0x3b/0x190 tcp_disconnect+0x138c/0x1aa0 inet_child_forget+0x6f/0x2e0 inet_csk_listen_stop+0x209/0x1060 __mptcp_close_ssk+0x52d/0x610 mptcp_destroy_common+0x165/0x640 mptcp_destroy+0x13/0x80 __mptcp_destroy_sock+0xe7/0x270 __mptcp_close+0x70e/0x9b0 mptcp_close+0x2b/0x150 inet_release+0xe9/0x1f0 __sock_release+0xd2/0x280 sock_close+0x15/0x20 __fput+0x252/0xa20 task_work_run+0x169/0x250 exit_to_user_mode_prepare+0x113/0x120 syscall_exit_to_user_mode+0x1d/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc The msk grace period can legitly expire in between the last reference count dropped in mptcp_subflow_queue_clean() and the later eventual access in inet_csk_listen_stop() After the previo",
    "evidence": "osv:CVE-2023-53088",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.22",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-53088",
      "aliases": [
        "CVE-2023-53088"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
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            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "5564be74a22a61855f8b8c100d8c4abb003bb792"
                },
                {
                  "fixed": "0f4f4cf5d32f10543deb946a37111e714579511e"
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                {
                  "fixed": "0a3f4f1f9c27215e4ddcd312558342e57b93e518"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "5.18.10"
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                  "fixed": "5.19"
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              "type": "GIT",
              "events": [
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          "versions": [
            "v5.18.19",
            "v5.18.18",
            "v5.18.17",
            "v5.18.16",
            "v5.18.15",
            "v5.18.14",
            "v5.18.13",
            "v5.18.12",
            "v5.18.11",
            "v5.18.10"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53088.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "6.1.22"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53088.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.716085112Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518",
        "https://git.kernel.org/stable/c/0f4f4cf5d32f10543deb946a37111e714579511e",
        "https://git.kernel.org/stable/c/5564be74a22a61855f8b8c100d8c4abb003bb792",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53088.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53088",
        "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/2023/53xxx/CVE-2023-53088.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53088",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509287,
  "published_at": "2025-05-02T15:55:34.84+00:00"
}