GHSA-G2F4-7X3W-9R2X

Vulnerability from github – Published: 2024-12-27 15:31 – Updated: 2025-11-03 21:31
VLAI
Details

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_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696 [<0000000015b6f64d>] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735 [<0000000010122488>] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865 [<00000000b4b70023>] __sys_connect+0x165/0x1a0 net/socket.c:1882 [<00000000f4cb3815>] __do_sys_connect net/socket.c:1892 [inline] [<00000000f4cb3815>] __se_sys_connect net/socket.c:1889 [inline] [<00000000f4cb3815>] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889 [<00000000e7b1e839>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 [<0000000055e91434>] entry_SYSCALL_64_after_hwframe+0x67/0xd1

Clean up the allocated memory in case of dccp_feat_push_confirm() failure and bail out with an error reset code.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2024-56643"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-27T15:15:24Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndccp: Fix memory leak in dccp_feat_change_recv\n\nIf dccp_feat_push_confirm() fails after new value for SP feature was accepted\nwithout reconciliation (\u0027entry == NULL\u0027 branch), memory allocated for that value\nwith dccp_feat_clone_sp_val() is never freed.\n\nHere is the kmemleak stack for this:\n\nunreferenced object 0xffff88801d4ab488 (size 8):\n  comm \"syz-executor310\", pid 1127, jiffies 4295085598 (age 41.666s)\n  hex dump (first 8 bytes):\n    01 b4 4a 1d 80 88 ff ff                          ..J.....\n  backtrace:\n    [\u003c00000000db7cabfe\u003e] kmemdup+0x23/0x50 mm/util.c:128\n    [\u003c0000000019b38405\u003e] kmemdup include/linux/string.h:465 [inline]\n    [\u003c0000000019b38405\u003e] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline]\n    [\u003c0000000019b38405\u003e] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline]\n    [\u003c0000000019b38405\u003e] dccp_feat_change_recv net/dccp/feat.c:1145 [inline]\n    [\u003c0000000019b38405\u003e] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416\n    [\u003c00000000b1f6d94a\u003e] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125\n    [\u003c0000000030d7b621\u003e] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650\n    [\u003c000000001f74c72e\u003e] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688\n    [\u003c00000000a6c24128\u003e] sk_backlog_rcv include/net/sock.h:1041 [inline]\n    [\u003c00000000a6c24128\u003e] __release_sock+0x139/0x3b0 net/core/sock.c:2570\n    [\u003c00000000cf1f3a53\u003e] release_sock+0x54/0x1b0 net/core/sock.c:3111\n    [\u003c000000008422fa23\u003e] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline]\n    [\u003c000000008422fa23\u003e] __inet_stream_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696\n    [\u003c0000000015b6f64d\u003e] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735\n    [\u003c0000000010122488\u003e] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865\n    [\u003c00000000b4b70023\u003e] __sys_connect+0x165/0x1a0 net/socket.c:1882\n    [\u003c00000000f4cb3815\u003e] __do_sys_connect net/socket.c:1892 [inline]\n    [\u003c00000000f4cb3815\u003e] __se_sys_connect net/socket.c:1889 [inline]\n    [\u003c00000000f4cb3815\u003e] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889\n    [\u003c00000000e7b1e839\u003e] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\n    [\u003c0000000055e91434\u003e] entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nClean up the allocated memory in case of dccp_feat_push_confirm() failure\nand bail out with an error reset code.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.",
  "id": "GHSA-g2f4-7x3w-9r2x",
  "modified": "2025-11-03T21:31:56Z",
  "published": "2024-12-27T15:31:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56643"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22be4727a8f898442066bcac34f8a1ad0bc72e14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/623be080ab3c13d71570bd32f7202a8efa8e2252"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ff67909ee2ffad911e3122616df41dee23ff4f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ee68b0f23706a77f53c832457b9384178b76421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc3d4423def1a9412a0ae454cb4477089ab79276"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c99507fff94b926fc92279c92d80f229c91cb85d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3ec686a369fae5034303061f003cd3f94ddfd23"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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