{"cve":"CVE-2023-53831","nvd":{"published":"2025-12-09T16:17:22.017","modified":"2026-06-17T06:46:08.910","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: read sk->sk_family once in sk_mc_loop()\n\nsyzbot is playing with IPV6_ADDRFORM quite a lot these days,\nand managed to hit the WARN_ON_ONCE(1) in sk_mc_loop()\n\nWe have many more similar issues to fix.\n\nWARNING: CPU: 1 PID: 1593 at net/core/sock.c:782 sk_mc_loop+0x165/0x260\nModules linked in:\nCPU: 1 PID: 1593 Comm: kworker/1:3 Not tainted 6.1.40-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023\nWorkqueue: events_power_efficient gc_worker\nRIP: 0010:sk_mc_loop+0x165/0x260 net/core/sock.c:782\nCode: 34 1b fd 49 81 c7 18 05 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 25 36 6d fd 4d 8b 37 eb 13 e8 db 33 1b fd <0f> 0b b3 01 eb 34 e8 d0 33 1b fd 45 31 f6 49 83 c6 38 4c 89 f0 48\nRSP: 0018:ffffc90000388530 EFLAGS: 00010246\nRAX: ffffffff846d9b55 RBX: 0000000000000011 RCX: ffff88814f884980\nRDX: 0000000000000102 RSI: ffffffff87ae5160 RDI: 0000000000000011\nRBP: ffffc90000388550 R08: 0000000000000003 R09: ffffffff846d9a65\nR10: 0000000000000002 R11: ffff88814f884980 R12: dffffc0000000000\nR13: ffff88810dbee000 R14: 0000000000000010 R15: ffff888150084000\nFS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020000180 CR3: 000000014ee5b000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n<IRQ>\n[<ffffffff8507734f>] ip6_finish_output2+0x33f/0x1ae0 net/ipv6/ip6_output.c:83\n[<ffffffff85062766>] __ip6_finish_output net/ipv6/ip6_output.c:200 [inline]\n[<ffffffff85062766>] ip6_finish_output+0x6c6/0xb10 net/ipv6/ip6_output.c:211\n[<ffffffff85061f8c>] NF_HOOK_COND include/linux/netfilter.h:298 [inline]\n[<ffffffff85061f8c>] ip6_output+0x2bc/0x3d0 net/ipv6/ip6_output.c:232\n[<ffffffff852071cf>] dst_output include/net/dst.h:444 [inline]\n[<ffffffff852071cf>] ip6_local_out+0x10f/0x140 net/ipv6/output_core.c:161\n[<ffffffff83618fb4>] ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:483 [inline]\n[<ffffffff83618fb4>] ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:529 [inline]\n[<ffffffff83618fb4>] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\n[<ffffffff83618fb4>] ipvlan_queue_xmit+0x1174/0x1be0 drivers/net/ipvlan/ipvlan_core.c:677\n[<ffffffff8361ddd9>] ipvlan_start_xmit+0x49/0x100 drivers/net/ipvlan/ipvlan_main.c:229\n[<ffffffff84763fc0>] netdev_start_xmit include/linux/netdevice.h:4925 [inline]\n[<ffffffff84763fc0>] xmit_one net/core/dev.c:3644 [inline]\n[<ffffffff84763fc0>] dev_hard_start_xmit+0x320/0x980 net/core/dev.c:3660\n[<ffffffff8494c650>] sch_direct_xmit+0x2a0/0x9c0 net/sched/sch_generic.c:342\n[<ffffffff8494d883>] qdisc_restart net/sched/sch_generic.c:407 [inline]\n[<ffffffff8494d883>] __qdisc_run+0xb13/0x1e70 net/sched/sch_generic.c:415\n[<ffffffff8478c426>] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n[<ffffffff84796eac>] net_tx_action+0x7ac/0x940 net/core/dev.c:5247\n[<ffffffff858002bd>] __do_softirq+0x2bd/0x9bd kernel/softirq.c:599\n[<ffffffff814c3fe8>] invoke_softirq kernel/softirq.c:430 [inline]\n[<ffffffff814c3fe8>] __irq_exit_rcu+0xc8/0x170 kernel/softirq.c:683\n[<ffffffff814c3f09>] irq_exit_rcu+0x9/0x20 kernel/softirq.c:695","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/41f10a4d78fe69d685a3172e6884297f233dcf95","https://git.kernel.org/stable/c/7586a66b9c4f1b8a825ea1dfa3a91aad5cc7b89b","https://git.kernel.org/stable/c/895dc4c47171a20035cdaa8d74c1c1e97f2fc974","https://git.kernel.org/stable/c/9036b6342fcdab190d6edce3dd447859c1de90fc","https://git.kernel.org/stable/c/a3e0fdf71bbe031de845e8e08ed7fba49f9c702c"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2023-53831","score":0.00257,"percentile":0.1741,"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."]}