{"id":"DEBIAN-CVE-2025-21877","details":"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:  \u003cTASK\u003e  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  \u003c/TASK\u003e","modified":"2026-09-01T16:06:10.474576680Z","published":"2025-03-27T15:15:55.540Z","upstream":["CVE-2025-21877"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-21877"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.133-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21877.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.19-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21877.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.19-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-21877.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}