{"cve":"CVE-2023-54112","nvd":{"published":"2025-12-24T13:16:13.103","modified":"2026-06-17T06:46:49.353","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Fix memory leak in error path of kcm_sendmsg()\n\nsyzbot reported a memory leak like below:\n\nBUG: memory leak\nunreferenced object 0xffff88810b088c00 (size 240):\n  comm \"syz-executor186\", pid 5012, jiffies 4294943306 (age 13.680s)\n  hex dump (first 32 bytes):\n    00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace:\n    [<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634\n    [<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline]\n    [<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815\n    [<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline]\n    [<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748\n    [<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494\n    [<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548\n    [<ffffffff83e4c536>] __sys_sendmsg+0xa6/0x120 net/socket.c:2577\n    [<ffffffff84ad7bb8>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n    [<ffffffff84ad7bb8>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80\n    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nIn kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append\nnewly allocated skbs to 'head'. If some bytes are copied, an error occurred,\nand jumped to out_error label, 'last_skb' is left unmodified. A later\nkcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the\n'head' frag_list and causing the leak.\n\nThis patch fixes this issue by properly updating the last allocated skb in\n'last_skb'.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/16989de75497574b5fafd174c0c233d5a86858b7","https://git.kernel.org/stable/c/33db24ad811b3576a0c2f8862506763f2be925b0","https://git.kernel.org/stable/c/479c71cda14b3c3a6515773faa39055333eaa2b7","https://git.kernel.org/stable/c/5e5554389397e98fafb9efe395d8b4830dd5f042","https://git.kernel.org/stable/c/8dc7eb757b1652b82725f32e0c89a1e9f6c0e13b"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:18:08.089039631+00:00"},"epss":{"cve":"CVE-2023-54112","score":0.0021,"percentile":0.1122,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}