{"cve":"CVE-2023-54176","nvd":{"published":"2025-12-30T13:16:05.470","modified":"2026-06-17T06:46:56.603","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: stricter state check in mptcp_worker\n\nAs reported by Christoph, the mptcp protocol can run the\nworker when the relevant msk socket is in an unexpected state:\n\nconnect()\n// incoming reset + fastclose\n// the mptcp worker is scheduled\nmptcp_disconnect()\n// msk is now CLOSED\nlisten()\nmptcp_worker()\n\nLeading to the following splat:\n\ndivide error: 0000 [#1] PREEMPT SMP\nCPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 6.3.0-rc1-gde5e8fd0123c #11\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\nWorkqueue: events mptcp_worker\nRIP: 0010:__tcp_select_window+0x22c/0x4b0 net/ipv4/tcp_output.c:3018\nRSP: 0018:ffffc900000b3c98 EFLAGS: 00010293\nRAX: 000000000000ffd7 RBX: 000000000000ffd7 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: ffffffff8214ce97 RDI: 0000000000000004\nRBP: 000000000000ffd7 R08: 0000000000000004 R09: 0000000000010000\nR10: 000000000000ffd7 R11: ffff888005afa148 R12: 000000000000ffd7\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\nFS:  0000000000000000(0000) GS:ffff88803ed00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000405270 CR3: 000000003011e006 CR4: 0000000000370ee0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n tcp_select_window net/ipv4/tcp_output.c:262 [inline]\n __tcp_transmit_skb+0x356/0x1280 net/ipv4/tcp_output.c:1345\n tcp_transmit_skb net/ipv4/tcp_output.c:1417 [inline]\n tcp_send_active_reset+0x13e/0x320 net/ipv4/tcp_output.c:3459\n mptcp_check_fastclose net/mptcp/protocol.c:2530 [inline]\n mptcp_worker+0x6c7/0x800 net/mptcp/protocol.c:2705\n process_one_work+0x3bd/0x950 kernel/workqueue.c:2390\n worker_thread+0x5b/0x610 kernel/workqueue.c:2537\n kthread+0x138/0x170 kernel/kthread.c:376\n ret_from_fork+0x2c/0x50 arch/x86/entry/entry_64.S:308\n </TASK>\n\nThis change addresses the issue explicitly checking for bad states\nbefore running the mptcp worker.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/19ea79e87af32c2b3c6fc49bd84efeb35ca57678","https://git.kernel.org/stable/c/aff9099e9c51f15c8def05c75b2b73e8487b5d54","https://git.kernel.org/stable/c/d6a0443733434408f2cbd4c53fea6910599bab9e","https://git.kernel.org/stable/c/f0b4a4086cf27240fc621a560da9735159049dcc"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:18:08.089039631+00:00"},"epss":{"cve":"CVE-2023-54176","score":0.00199,"percentile":0.09806,"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."]}