{"id":"CVE-2024-56643","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-56643","generatedAt":"2026-10-28T03:23:55.199Z","title":"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…","description":"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 ('entry == NULL' 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    [<00000000db7cabfe>] kmemdup+0x23/0x50 mm/util.c:128\n    [<0000000019b38405>] kmemdup include/linux/string.h:465 [inline]\n    [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:371 [inline]\n    [<0000000019b38405>] dccp_feat_clone_sp_val net/dccp/feat.c:367 [inline]\n    [<0000000019b38405>] dccp_feat_change_recv net/dccp/feat.c:1145 [inline]\n    [<0000000019b38405>] dccp_feat_parse_options+0x1196/0x2180 net/dccp/feat.c:1416\n    [<00000000b1f6d94a>] dccp_parse_options+0xa2a/0x1260 net/dccp/options.c:125\n    [<0000000030d7b621>] dccp_rcv_state_process+0x197/0x13d0 net/dccp/input.c:650\n    [<000000001f74c72e>] dccp_v4_do_rcv+0xf9/0x1a0 net/dccp/ipv4.c:688\n    [<00000000a6c24128>] sk_backlog_rcv include/net/sock.h:1041 [inline]\n    [<00000000a6c24128>] __release_sock+0x139/0x3b0 net/core/sock.c:2570\n    [<00000000cf1f3a53>] release_sock+0x54/0x1b0 net/core/sock.c:3111\n    [<000000008422fa23>] inet_wait_for_connect net/ipv4/af_inet.c:603 [inline]\n    [<000000008422fa23>] __inet_stream_connect+0x5d0/0xf70 net/ipv4/af_inet.c:696\n    [<0000000015b6f64d>] inet_stream_connect+0x53/0xa0 net/ipv4/af_inet.c:735\n    [<0000000010122488>] __sys_connect_file+0x15c/0x1a0 net/socket.c:1865\n    [<00000000b4b70023>] __sys_connect+0x165/0x1a0 net/socket.c:1882\n    [<00000000f4cb3815>] __do_sys_connect net/socket.c:1892 [inline]\n    [<00000000f4cb3815>] __se_sys_connect net/socket.c:1889 [inline]\n    [<00000000f4cb3815>] __x64_sys_connect+0x6e/0xb0 net/socket.c:1889\n    [<00000000e7b1e839>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\n    [<0000000055e91434>] 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.","published":"2024-12-27T15:15:24.000Z","lastModified":"2026-06-17T08:12:38.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-401"],"affected":["linux/linux kernel"],"epss":{"score":0.00229,"percentile":0.13593,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/22be4727a8f898442066bcac34f8a1ad0bc72e14","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/623be080ab3c13d71570bd32f7202a8efa8e2252","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6ff67909ee2ffad911e3122616df41dee23ff4f6","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9ee68b0f23706a77f53c832457b9384178b76421","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/bc3d4423def1a9412a0ae454cb4477089ab79276","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c99507fff94b926fc92279c92d80f229c91cb85d","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d3ec686a369fae5034303061f003cd3f94ddfd23","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-56643","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}