mptcp: Correctly set DATA_FIN timeout when number of retransmits is large

{
  "id": "013fc3ddd9f73c1ef6ed369026ea48f38d6874a7119d0ca49263dc253f44035a",
  "url": "https://osv.dev/vulnerability/CVE-2022-48906",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mptcp: Correctly set DATA_FIN timeout when number of retransmits is large",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mptcp: Correctly set DATA_FIN timeout when number of retransmits is large Syzkaller with UBSAN uncovered a scenario where a large number of DATA_FIN retransmits caused a shift-out-of-bounds in the DATA_FIN timeout calculation: ================================================================================ UBSAN: shift-out-of-bounds in net/mptcp/protocol.c:470:29 shift exponent 32 is too large for 32-bit type 'unsigned int' CPU: 1 PID: 13059 Comm: kworker/1:0 Not tainted 5.17.0-rc2-00630-g5fbf21c90c60 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events mptcp_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 ubsan_epilogue+0xb/0x5a lib/ubsan.c:151 __ubsan_handle_shift_out_of_bounds.cold+0xb2/0x20e lib/ubsan.c:330 mptcp_set_datafin_timeout net/mptcp/protocol.c:470 [inline] __mptcp_retrans.cold+0x72/0x77 net/mptcp/protocol.c:2445 mptcp_worker+0x58a/0xa70 net/mptcp/protocol.c:2528 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2307 worker_thread+0x95/0xe10 kernel/workqueue.c:2454 kthread+0x2f4/0x3b0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ================================================================================ This change limits the maximum timeout by limiting the size of the shift, which keeps all intermediate values in-bounds.",
    "evidence": "osv:CVE-2022-48906",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.27",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.16.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-48906",
      "aliases": [
        "CVE-2022-48906"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "0c3f34beb459753f9f80d0cc14c1b50ab615c631"
                },
                {
                  "fixed": "03ae283bd71f761feae3f402668d698b393b0e79"
                },
                {
                  "fixed": "877d11f0332cd2160e19e3313e262754c321fa36"
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            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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          "versions": [
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            "v5.12.18",
            "v5.12.17",
            "v5.12.16",
            "v5.12.15",
            "v5.12.14",
            "v5.12.13",
            "v5.12.12",
            "v5.12.11",
            "v5.12.10",
            "v5.12.9",
            "v5.12.8",
            "v5.12.7",
            "v5.12.6",
            "v5.12.5",
            "v5.12.4"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48906.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.13.0"
                },
                {
                  "fixed": "5.15.27"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.16.13"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48906.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.685974118Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/03ae283bd71f761feae3f402668d698b393b0e79",
        "https://git.kernel.org/stable/c/0c3f34beb459753f9f80d0cc14c1b50ab615c631",
        "https://git.kernel.org/stable/c/877d11f0332cd2160e19e3313e262754c321fa36",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48906.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-48906",
        "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/2022/48xxx/CVE-2022-48906.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-48906",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492238,
  "published_at": "2024-08-22T01:30:40.85+00:00"
}