GHSA-5GHM-J624-HFM6
Vulnerability from github – Published: 2025-09-15 15:31 – Updated: 2025-12-02 03:31In the Linux kernel, the following vulnerability has been resolved:
vxlan: Fix nexthop hash size
The nexthop code expects a 31 bit hash, such as what is returned by fib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash returned by skb_get_hash() can lead to problems related to the fact that 'int hash' is a negative number when the MSB is set.
In the case of hash threshold nexthop groups, nexthop_select_path_hthr() will disproportionately select the first nexthop group entry. In the case of resilient nexthop groups, nexthop_select_path_res() may do an out of bounds access in nh_buckets[], for example: hash = -912054133 num_nh_buckets = 2 bucket_index = 65535
which leads to the following panic:
BUG: unable to handle page fault for address: ffffc900025910c8 PGD 100000067 P4D 100000067 PUD 10026b067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 4 PID: 856 Comm: kworker/4:3 Not tainted 6.5.0-rc2+ #34 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:nexthop_select_path+0x197/0xbf0 Code: c1 e4 05 be 08 00 00 00 4c 8b 35 a4 14 7e 01 4e 8d 6c 25 00 4a 8d 7c 25 08 48 01 dd e8 c2 25 15 ff 49 8d 7d 08 e8 39 13 15 ff <4d> 89 75 08 48 89 ef e8 7d 12 15 ff 48 8b 5d 00 e8 14 55 2f 00 85 RSP: 0018:ffff88810c36f260 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000002000c0 RCX: ffffffffaf02dd77 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffc900025910c8 RBP: ffffc900025910c0 R08: 0000000000000001 R09: fffff520004b2219 R10: ffffc900025910cf R11: 31392d2068736168 R12: 00000000002000c0 R13: ffffc900025910c0 R14: 00000000fffef608 R15: ffff88811840e900 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc900025910c8 CR3: 0000000129d00000 CR4: 0000000000750ee0 PKRU: 55555554 Call Trace: ? __die+0x23/0x70 ? page_fault_oops+0x1ee/0x5c0 ? __pfx_is_prefetch.constprop.0+0x10/0x10 ? __pfx_page_fault_oops+0x10/0x10 ? search_bpf_extables+0xfe/0x1c0 ? fixup_exception+0x3b/0x470 ? exc_page_fault+0xf6/0x110 ? asm_exc_page_fault+0x26/0x30 ? nexthop_select_path+0x197/0xbf0 ? nexthop_select_path+0x197/0xbf0 ? lock_is_held_type+0xe7/0x140 vxlan_xmit+0x5b2/0x2340 ? __lock_acquire+0x92b/0x3370 ? __pfx_vxlan_xmit+0x10/0x10 ? __pfxlockacquire+0x10/0x10 ? pfx_register_lock_class+0x10/0x10 ? skb_network_protocol+0xce/0x2d0 ? dev_hard_start_xmit+0xca/0x350 ? __pfx_vxlan_xmit+0x10/0x10 dev_hard_start_xmit+0xca/0x350 __dev_queue_xmit+0x513/0x1e20 ? __pfxdevqueue_xmit+0x10/0x10 ? pfx_lock_release+0x10/0x10 ? mark_held_locks+0x44/0x90 ? skb_push+0x4c/0x80 ? eth_header+0x81/0xe0 ? __pfx_eth_header+0x10/0x10 ? neigh_resolve_output+0x215/0x310 ? ip6_finish_output2+0x2ba/0xc90 ip6_finish_output2+0x2ba/0xc90 ? lock_release+0x236/0x3e0 ? ip6_mtu+0xbb/0x240 ? __pfx_ip6_finish_output2+0x10/0x10 ? find_held_lock+0x83/0xa0 ? lock_is_held_type+0xe7/0x140 ip6_finish_output+0x1ee/0x780 ip6_output+0x138/0x460 ? __pfx_ip6_output+0x10/0x10 ? __pfxlockacquire+0x10/0x10 ? pfx_ip6_finish_output+0x10/0x10 NF_HOOK.constprop.0+0xc0/0x420 ? __pfx_NF_HOOK.constprop.0+0x10/0x10 ? ndisc_send_skb+0x2c0/0x960 ? __pfx_lock_release+0x10/0x10 ? __local_bh_enable_ip+0x93/0x110 ? lock_is_held_type+0xe7/0x140 ndisc_send_skb+0x4be/0x960 ? __pfx_ndisc_send_skb+0x10/0x10 ? mark_held_locks+0x65/0x90 ? find_held_lock+0x83/0xa0 ndisc_send_ns+0xb0/0x110 ? __pfx_ndisc_send_ns+0x10/0x10 addrconf_dad_work+0x631/0x8e0 ? lock_acquire+0x180/0x3f0 ? __pfx_addrconf_dad_work+0x10/0x10 ? mark_held_locks+0x24/0x90 process_one_work+0x582/0x9c0 ? __pfx_process_one_work+0x10/0x10 ? __pfx_do_raw_spin_lock+0x10/0x10 ? mark_held_locks+0x24/0x90 worker_thread+0x93/0x630 ? __kthread_parkme+0xdc/0x100 ? __pfx_worker_thread+0x10/0x10 kthread+0x1a5/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x60
---truncated---
{
"affected": [],
"aliases": [
"CVE-2023-53192"
],
"database_specific": {
"cwe_ids": [
"CWE-129"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-15T14:15:41Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: Fix nexthop hash size\n\nThe nexthop code expects a 31 bit hash, such as what is returned by\nfib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash\nreturned by skb_get_hash() can lead to problems related to the fact that\n\u0027int hash\u0027 is a negative number when the MSB is set.\n\nIn the case of hash threshold nexthop groups, nexthop_select_path_hthr()\nwill disproportionately select the first nexthop group entry. In the case\nof resilient nexthop groups, nexthop_select_path_res() may do an out of\nbounds access in nh_buckets[], for example:\n hash = -912054133\n num_nh_buckets = 2\n bucket_index = 65535\n\nwhich leads to the following panic:\n\nBUG: unable to handle page fault for address: ffffc900025910c8\nPGD 100000067 P4D 100000067 PUD 10026b067 PMD 0\nOops: 0002 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 4 PID: 856 Comm: kworker/4:3 Not tainted 6.5.0-rc2+ #34\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\nWorkqueue: ipv6_addrconf addrconf_dad_work\nRIP: 0010:nexthop_select_path+0x197/0xbf0\nCode: c1 e4 05 be 08 00 00 00 4c 8b 35 a4 14 7e 01 4e 8d 6c 25 00 4a 8d 7c 25 08 48 01 dd e8 c2 25 15 ff 49 8d 7d 08 e8 39 13 15 ff \u003c4d\u003e 89 75 08 48 89 ef e8 7d 12 15 ff 48 8b 5d 00 e8 14 55 2f 00 85\nRSP: 0018:ffff88810c36f260 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: 00000000002000c0 RCX: ffffffffaf02dd77\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffc900025910c8\nRBP: ffffc900025910c0 R08: 0000000000000001 R09: fffff520004b2219\nR10: ffffc900025910cf R11: 31392d2068736168 R12: 00000000002000c0\nR13: ffffc900025910c0 R14: 00000000fffef608 R15: ffff88811840e900\nFS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffc900025910c8 CR3: 0000000129d00000 CR4: 0000000000750ee0\nPKRU: 55555554\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x23/0x70\n ? page_fault_oops+0x1ee/0x5c0\n ? __pfx_is_prefetch.constprop.0+0x10/0x10\n ? __pfx_page_fault_oops+0x10/0x10\n ? search_bpf_extables+0xfe/0x1c0\n ? fixup_exception+0x3b/0x470\n ? exc_page_fault+0xf6/0x110\n ? asm_exc_page_fault+0x26/0x30\n ? nexthop_select_path+0x197/0xbf0\n ? nexthop_select_path+0x197/0xbf0\n ? lock_is_held_type+0xe7/0x140\n vxlan_xmit+0x5b2/0x2340\n ? __lock_acquire+0x92b/0x3370\n ? __pfx_vxlan_xmit+0x10/0x10\n ? __pfx___lock_acquire+0x10/0x10\n ? __pfx_register_lock_class+0x10/0x10\n ? skb_network_protocol+0xce/0x2d0\n ? dev_hard_start_xmit+0xca/0x350\n ? __pfx_vxlan_xmit+0x10/0x10\n dev_hard_start_xmit+0xca/0x350\n __dev_queue_xmit+0x513/0x1e20\n ? __pfx___dev_queue_xmit+0x10/0x10\n ? __pfx_lock_release+0x10/0x10\n ? mark_held_locks+0x44/0x90\n ? skb_push+0x4c/0x80\n ? eth_header+0x81/0xe0\n ? __pfx_eth_header+0x10/0x10\n ? neigh_resolve_output+0x215/0x310\n ? ip6_finish_output2+0x2ba/0xc90\n ip6_finish_output2+0x2ba/0xc90\n ? lock_release+0x236/0x3e0\n ? ip6_mtu+0xbb/0x240\n ? __pfx_ip6_finish_output2+0x10/0x10\n ? find_held_lock+0x83/0xa0\n ? lock_is_held_type+0xe7/0x140\n ip6_finish_output+0x1ee/0x780\n ip6_output+0x138/0x460\n ? __pfx_ip6_output+0x10/0x10\n ? __pfx___lock_acquire+0x10/0x10\n ? __pfx_ip6_finish_output+0x10/0x10\n NF_HOOK.constprop.0+0xc0/0x420\n ? __pfx_NF_HOOK.constprop.0+0x10/0x10\n ? ndisc_send_skb+0x2c0/0x960\n ? __pfx_lock_release+0x10/0x10\n ? __local_bh_enable_ip+0x93/0x110\n ? lock_is_held_type+0xe7/0x140\n ndisc_send_skb+0x4be/0x960\n ? __pfx_ndisc_send_skb+0x10/0x10\n ? mark_held_locks+0x65/0x90\n ? find_held_lock+0x83/0xa0\n ndisc_send_ns+0xb0/0x110\n ? __pfx_ndisc_send_ns+0x10/0x10\n addrconf_dad_work+0x631/0x8e0\n ? lock_acquire+0x180/0x3f0\n ? __pfx_addrconf_dad_work+0x10/0x10\n ? mark_held_locks+0x24/0x90\n process_one_work+0x582/0x9c0\n ? __pfx_process_one_work+0x10/0x10\n ? __pfx_do_raw_spin_lock+0x10/0x10\n ? mark_held_locks+0x24/0x90\n worker_thread+0x93/0x630\n ? __kthread_parkme+0xdc/0x100\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x1a5/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x60\n \n---truncated---",
"id": "GHSA-5ghm-j624-hfm6",
"modified": "2025-12-02T03:31:36Z",
"published": "2025-09-15T15:31:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53192"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0756384fb1bd38adb2ebcfd1307422f433a1d772"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/23c195ce6f4aec86e1c9e1ea1c800381c4b465c7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/32ef2c0c6cf11a076f0280a7866b9abc47821e19"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7b8717658dff8b471cbfc124bf9b5ca4229579ed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c650597647ecb318d02372277bdfd866c6829f78"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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