net: read sk->sk_family once in sk_mc_loop()

{
  "id": "851825dee27535dd413a0a223c8a729464ddab25a79cc63813714118e079cbe2",
  "url": "https://osv.dev/vulnerability/CVE-2023-53831",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: read sk->sk_family once in sk_mc_loop()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: read sk->sk_family once in sk_mc_loop() syzbot is playing with IPV6_ADDRFORM quite a lot these days, and managed to hit the WARN_ON_ONCE(1) in sk_mc_loop() We have many more similar issues to fix. WARNING: CPU: 1 PID: 1593 at net/core/sock.c:782 sk_mc_loop+0x165/0x260 Modules linked in: CPU: 1 PID: 1593 Comm: kworker/1:3 Not tainted 6.1.40-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events_power_efficient gc_worker RIP: 0010:sk_mc_loop+0x165/0x260 net/core/sock.c:782 Code: 34 1b fd 49 81 c7 18 05 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 25 36 6d fd 4d 8b 37 eb 13 e8 db 33 1b fd <0f> 0b b3 01 eb 34 e8 d0 33 1b fd 45 31 f6 49 83 c6 38 4c 89 f0 48 RSP: 0018:ffffc90000388530 EFLAGS: 00010246 RAX: ffffffff846d9b55 RBX: 0000000000000011 RCX: ffff88814f884980 RDX: 0000000000000102 RSI: ffffffff87ae5160 RDI: 0000000000000011 RBP: ffffc90000388550 R08: 0000000000000003 R09: ffffffff846d9a65 R10: 0000000000000002 R11: ffff88814f884980 R12: dffffc0000000000 R13: ffff88810dbee000 R14: 0000000000000010 R15: ffff888150084000 FS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000014ee5b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000",
    "evidence": "osv:CVE-2023-53831",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.326",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "4.19.295",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.257",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.195",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.132",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.5.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53831",
      "aliases": [
        "CVE-2023-53831"
      ],
      "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": "e918d0211ffbaf039447334c3460cafee1ce0157"
                },
                {
                  "fixed": "41f10a4d78fe69d685a3172e6884297f233dcf95"
                },
                {
                  "fixed": "895dc4c47171a20035cdaa8d74c1c1e97f2fc974"
                },
                {
                  "fixed": "ed4e0adfa407ab65dd73b8862ebf2f308a0349d2"
                },
                {
                  "fixed": "9036b6342fcdab190d6edce3dd447859c1de90fc"
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                {
                  "fixed": "b1f5b890b89cb38a6c0bac91984d56cd69808e8c"
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                {
                  "fixed": "a3e0fdf71bbe031de845e8e08ed7fba49f9c702c"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53831.json"
          }
        },
        {
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "2.6.33"
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                {
                  "fixed": "4.14.326"
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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-2023-53831.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.976582262Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/41f10a4d78fe69d685a3172e6884297f233dcf95",
        "https://git.kernel.org/stable/c/7586a66b9c4f1b8a825ea1dfa3a91aad5cc7b89b",
        "https://git.kernel.org/stable/c/895dc4c47171a20035cdaa8d74c1c1e97f2fc974",
        "https://git.kernel.org/stable/c/9036b6342fcdab190d6edce3dd447859c1de90fc",
        "https://git.kernel.org/stable/c/a3e0fdf71bbe031de845e8e08ed7fba49f9c702c",
        "https://git.kernel.org/stable/c/b1f5b890b89cb38a6c0bac91984d56cd69808e8c",
        "https://git.kernel.org/stable/c/e918d0211ffbaf039447334c3460cafee1ce0157",
        "https://git.kernel.org/stable/c/ed4e0adfa407ab65dd73b8862ebf2f308a0349d2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53831.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53831",
        "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-2023-53831.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53831",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490650,
  "published_at": "2025-12-09T01:29:46.374+00:00"
}