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CVE-2025-21877usbnet: gl620a: fix endpoint checking in genelink_bind()

Description

In the Linux kernel, the following vulnerability has been resolved: usbnet: gl620a: fix endpoint checking in genelink_bind() Syzbot reports [1] a warning in usb_submit_urb() triggered by inconsistencies between expected and actually present endpoints in gl620a driver. Since genelink_bind() does not properly verify whether specified eps are in fact provided by the device, in this case, an artificially manufactured one, one may get a mismatch. Fix the issue by resorting to a usbnet utility function usbnet_get_endpoints(), usually reserved for this very problem. Check for endpoints and return early before proceeding further if any are missing. [1] Syzbot report: usb 5-1: Manufacturer: syz usb 5-1: SerialNumber: syz usb 5-1: config 0 descriptor?? gl620a 5-1:0.23 usb0: register 'gl620a' at usb-dummy_hcd.0-1, ... ------------[ cut here ]------------ usb 5-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 2 PID: 1841 at drivers/usb/core/urb.c:503 usb_submit_urb+0xe4b/0x1730 drivers/usb/core/urb.c:503 Modules linked in: CPU: 2 UID: 0 PID: 1841 Comm: kworker/2:2 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: mld mld_ifc_work RIP: 0010:usb_submit_urb+0xe4b/0x1730 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> usbnet_start_xmit+0x6be/0x2780 drivers/net/usb/usbnet.c:1467 __netdev_start_xmit include/linux/netdevice.h:5002 [inline] netdev_start_xmit include/linux/netdevice.h:5011 [inline] xmit_one net/core/dev.c:3590 [inline] dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3606 sch_direct_xmit+0x1ae/0xc30 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:3827 [inline] __dev_queue_xmit+0x13d4/0x43e0 net/core/dev.c:4400 dev_queue_xmit include/linux/netdevice.h:3168 [inline] neigh_resolve_output net/core/neighbour.c:1514 [inline] neigh_resolve_output+0x5bc/0x950 net/core/neighbour.c:1494 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0xb1b/0x2070 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:215 [inline] ip6_finish_output+0x3f9/0x1360 net/ipv6/ip6_output.c:226 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip6_output+0x1f8/0x540 net/ipv6/ip6_output.c:247 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] mld_sendpack+0x9f0/0x11d0 net/ipv6/mcast.c:1819 mld_send_cr net/ipv6/mcast.c:2120 [inline] mld_ifc_work+0x740/0xca0 net/ipv6/mcast.c:2651 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK>

Timeline

  1. ID reserved

    By Linux

  2. · 3 months later

    Published

  3. · 20 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-21877, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.23% · top 86% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 5f2dbabbce04b1ffcd6d8d07564adb94db577536
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 24dd971104057c8828d420a48e0a5af6e6f30d3e
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 9bcb8cbc3e5d67eb223bfb7e2291a270dbb699dc
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 67ebc3391c8377738e97a43374054d9718fdb6e4
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < a2ee5e55b50a97d13617c8653482c0ad4decff8c
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 4e8b8d43373bf837be159366f0192502f97ec7a5
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < ded25730c96949cb8b048b29c557e38569124943
    • affected 47ee3051c856cc2aa95d35d577a8cb37279d540f – < 1cf9631d836b289bd5490776551961c883ae8a4f

  • Linux · Linux

    • affected 2.6.14
    • unaffected < 2.6.14
    • unaffected 5.4.291 – ≤ 5.4.*
    • unaffected 5.10.235 – ≤ 5.10.*
    • unaffected 5.15.179 – ≤ 5.15.*
    • unaffected 6.1.130 – ≤ 6.1.*
    • unaffected 6.6.81 – ≤ 6.6.*
    • unaffected 6.12.18 – ≤ 6.12.*
    • unaffected 6.13.6 – ≤ 6.13.*
    • unaffected 6.14 – ≤ *

References

References10

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .