dccp: Fix memory leak in dccp_feat_change_recv

{
  "id": "9ca07c360082d19ac96de4893fbfd544071e70f41adfa31e8151220039903c61",
  "url": "https://osv.dev/vulnerability/CVE-2024-56643",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dccp: Fix memory leak in dccp_feat_change_recv",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dccp: Fix memory leak in dccp_feat_change_recv If dccp_feat_push_confirm() fails after new value for SP feature was accepted without reconciliation ('entry == NULL' branch), memory allocated for that value with dccp_feat_clone_sp_val() is never freed. Here is the kmemleak stack for this: unreferenced object 0xffff88801d4ab488 (size 8): comm \"syz-executor310\", pid 1127, jiffies 4295085598 (age 41.666s) hex dump (first 8 bytes): 01 b4 4a 1d 80 88 ff ff ..J..... backtrace: [<00000000db7cabfe>] kmemdup+0x23/0x50 mm/util.c:128 [<0000000019b38405>] kmemdup include/linux/string.h:465 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline] [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline] [<0000000019b38405>] dccp_feat_change_recv net/dccp/feat.c:1145 [inline] [<0000000019b38405>] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416 [<00000000b1f6d94a>] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125 [<0000000030d7b621>] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650 [<000000001f74c72e>] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688 [<00000000a6c24128>] sk_backlog_rcv include/net/sock.h:1041 [inline] [<00000000a6c24128>] __release_sock+0x139/0x3b0 net/core/sock.c:2570 [<00000000cf1f3a53>] release_sock+0x54/0x1b0 net/core/sock.c:3111 [<000000008422fa23>] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline] [<000000008422fa23>] __inet_stream_conne",
    "evidence": "osv:CVE-2024-56643",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.287",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.231",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.174",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.66",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "low",
    "structured": {
      "id": "CVE-2024-56643",
      "aliases": [
        "CVE-2024-56643"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "e77b8363b2ea7c0d89919547c1a8b0562f298b57"
                },
                {
                  "fixed": "623be080ab3c13d71570bd32f7202a8efa8e2252"
                },
                {
                  "fixed": "c99507fff94b926fc92279c92d80f229c91cb85d"
                },
                {
                  "fixed": "bc3d4423def1a9412a0ae454cb4477089ab79276"
                },
                {
                  "fixed": "6ff67909ee2ffad911e3122616df41dee23ff4f6"
                },
                {
                  "fixed": "d3ec686a369fae5034303061f003cd3f94ddfd23"
                },
                {
                  "fixed": "9ee68b0f23706a77f53c832457b9384178b76421"
                },
                {
                  "fixed": "22be4727a8f898442066bcac34f8a1ad0bc72e14"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56643.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.29"
                },
                {
                  "fixed": "5.4.287"
                }
              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.231"
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            {
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                {
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
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                {
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
                },
                {
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
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                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56643.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.511211838Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/22be4727a8f898442066bcac34f8a1ad0bc72e14",
        "https://git.kernel.org/stable/c/623be080ab3c13d71570bd32f7202a8efa8e2252",
        "https://git.kernel.org/stable/c/6ff67909ee2ffad911e3122616df41dee23ff4f6",
        "https://git.kernel.org/stable/c/9ee68b0f23706a77f53c832457b9384178b76421",
        "https://git.kernel.org/stable/c/bc3d4423def1a9412a0ae454cb4477089ab79276",
        "https://git.kernel.org/stable/c/c99507fff94b926fc92279c92d80f229c91cb85d",
        "https://git.kernel.org/stable/c/d3ec686a369fae5034303061f003cd3f94ddfd23",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56643.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56643",
        "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/2024/56xxx/CVE-2024-56643.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-56643",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522020,
  "published_at": "2024-12-27T15:02:44.492+00:00"
}