GHSA-83CQ-HC8W-3693

Vulnerability from github – Published: 2025-12-09 18:30 – Updated: 2025-12-09 18:30
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

net: read sk->sk_family once in sk_mc_loop()

syzbot is playing with IPV6_ADDRFORM quite a lot these days, and managed to hit the WARN_ON_ONCE(1) in sk_mc_loop()

We have many more similar issues to fix.

WARNING: CPU: 1 PID: 1593 at net/core/sock.c:782 sk_mc_loop+0x165/0x260 Modules linked in: CPU: 1 PID: 1593 Comm: kworker/1:3 Not tainted 6.1.40-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events_power_efficient gc_worker RIP: 0010:sk_mc_loop+0x165/0x260 net/core/sock.c:782 Code: 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 RSP: 0018:ffffc90000388530 EFLAGS: 00010246 RAX: ffffffff846d9b55 RBX: 0000000000000011 RCX: ffff88814f884980 RDX: 0000000000000102 RSI: ffffffff87ae5160 RDI: 0000000000000011 RBP: ffffc90000388550 R08: 0000000000000003 R09: ffffffff846d9a65 R10: 0000000000000002 R11: ffff88814f884980 R12: dffffc0000000000 R13: ffff88810dbee000 R14: 0000000000000010 R15: ffff888150084000 FS: 0000000000000000(0000) GS:ffff8881f6b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000014ee5b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: [] ip6_finish_output2+0x33f/0x1ae0 net/ipv6/ip6_output.c:83 [] __ip6_finish_output net/ipv6/ip6_output.c:200 [inline] [] ip6_finish_output+0x6c6/0xb10 net/ipv6/ip6_output.c:211 [] NF_HOOK_COND include/linux/netfilter.h:298 [inline] [] ip6_output+0x2bc/0x3d0 net/ipv6/ip6_output.c:232 [] dst_output include/net/dst.h:444 [inline] [] ip6_local_out+0x10f/0x140 net/ipv6/output_core.c:161 [] ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:483 [inline] [] ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:529 [inline] [] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline] [] ipvlan_queue_xmit+0x1174/0x1be0 drivers/net/ipvlan/ipvlan_core.c:677 [] ipvlan_start_xmit+0x49/0x100 drivers/net/ipvlan/ipvlan_main.c:229 [] netdev_start_xmit include/linux/netdevice.h:4925 [inline] [] xmit_one net/core/dev.c:3644 [inline] [] dev_hard_start_xmit+0x320/0x980 net/core/dev.c:3660 [] sch_direct_xmit+0x2a0/0x9c0 net/sched/sch_generic.c:342 [] qdisc_restart net/sched/sch_generic.c:407 [inline] [] __qdisc_run+0xb13/0x1e70 net/sched/sch_generic.c:415 [] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125 [] net_tx_action+0x7ac/0x940 net/core/dev.c:5247 [] __do_softirq+0x2bd/0x9bd kernel/softirq.c:599 [] invoke_softirq kernel/softirq.c:430 [inline] [] __irq_exit_rcu+0xc8/0x170 kernel/softirq.c:683 [] irq_exit_rcu+0x9/0x20 kernel/softirq.c:695

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{
  "affected": [],
  "aliases": [
    "CVE-2023-53831"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-09T16:17:22Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: read sk-\u003esk_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 \u003c0f\u003e 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\u003cIRQ\u003e\n[\u003cffffffff8507734f\u003e] ip6_finish_output2+0x33f/0x1ae0 net/ipv6/ip6_output.c:83\n[\u003cffffffff85062766\u003e] __ip6_finish_output net/ipv6/ip6_output.c:200 [inline]\n[\u003cffffffff85062766\u003e] ip6_finish_output+0x6c6/0xb10 net/ipv6/ip6_output.c:211\n[\u003cffffffff85061f8c\u003e] NF_HOOK_COND include/linux/netfilter.h:298 [inline]\n[\u003cffffffff85061f8c\u003e] ip6_output+0x2bc/0x3d0 net/ipv6/ip6_output.c:232\n[\u003cffffffff852071cf\u003e] dst_output include/net/dst.h:444 [inline]\n[\u003cffffffff852071cf\u003e] ip6_local_out+0x10f/0x140 net/ipv6/output_core.c:161\n[\u003cffffffff83618fb4\u003e] ipvlan_process_v6_outbound drivers/net/ipvlan/ipvlan_core.c:483 [inline]\n[\u003cffffffff83618fb4\u003e] ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:529 [inline]\n[\u003cffffffff83618fb4\u003e] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\n[\u003cffffffff83618fb4\u003e] ipvlan_queue_xmit+0x1174/0x1be0 drivers/net/ipvlan/ipvlan_core.c:677\n[\u003cffffffff8361ddd9\u003e] ipvlan_start_xmit+0x49/0x100 drivers/net/ipvlan/ipvlan_main.c:229\n[\u003cffffffff84763fc0\u003e] netdev_start_xmit include/linux/netdevice.h:4925 [inline]\n[\u003cffffffff84763fc0\u003e] xmit_one net/core/dev.c:3644 [inline]\n[\u003cffffffff84763fc0\u003e] dev_hard_start_xmit+0x320/0x980 net/core/dev.c:3660\n[\u003cffffffff8494c650\u003e] sch_direct_xmit+0x2a0/0x9c0 net/sched/sch_generic.c:342\n[\u003cffffffff8494d883\u003e] qdisc_restart net/sched/sch_generic.c:407 [inline]\n[\u003cffffffff8494d883\u003e] __qdisc_run+0xb13/0x1e70 net/sched/sch_generic.c:415\n[\u003cffffffff8478c426\u003e] qdisc_run+0xd6/0x260 include/net/pkt_sched.h:125\n[\u003cffffffff84796eac\u003e] net_tx_action+0x7ac/0x940 net/core/dev.c:5247\n[\u003cffffffff858002bd\u003e] __do_softirq+0x2bd/0x9bd kernel/softirq.c:599\n[\u003cffffffff814c3fe8\u003e] invoke_softirq kernel/softirq.c:430 [inline]\n[\u003cffffffff814c3fe8\u003e] __irq_exit_rcu+0xc8/0x170 kernel/softirq.c:683\n[\u003cffffffff814c3f09\u003e] irq_exit_rcu+0x9/0x20 kernel/softirq.c:695",
  "id": "GHSA-83cq-hc8w-3693",
  "modified": "2025-12-09T18:30:33Z",
  "published": "2025-12-09T18:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53831"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41f10a4d78fe69d685a3172e6884297f233dcf95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7586a66b9c4f1b8a825ea1dfa3a91aad5cc7b89b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/895dc4c47171a20035cdaa8d74c1c1e97f2fc974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9036b6342fcdab190d6edce3dd447859c1de90fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3e0fdf71bbe031de845e8e08ed7fba49f9c702c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1f5b890b89cb38a6c0bac91984d56cd69808e8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e918d0211ffbaf039447334c3460cafee1ce0157"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed4e0adfa407ab65dd73b8862ebf2f308a0349d2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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