# CVE-2026-43479: linux: In the Linux kernel, the following vulnerability has been resolved:  net: usb: lan78xx: fix WARN in __netif_napi_del_...

CVE-2026-43479 is fixed in linux on 1 platform by DEBIAN-CVE-2026-43479 (version 6.19.10-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-43479
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0011
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 13, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: usb: lan78xx: fix WARN in __netif_napi_del_locked on disconnect  Remove redundant netif_napi_del() call from disconnect path.  A WARN may be triggered in __netif_napi_del_locked() during USB device disconnect:    WARNING: CPU: 0 PID: 11 at net/core/dev.c:7417 __netif_napi_del_locked+0x2b4/0x350  This happens because netif_napi_del() is called in the disconnect path while NAPI is still enabled. However, it is not necessary to call netif_napi_del() explicitly, since unregister_netdev() will handle NAPI teardown automatically and safely. Removing the redundant call avoids triggering the warning.  Full trace:  lan78xx 1-1:1.0 enu1: Failed to read register index 0x000000c4. ret = -ENODEV  lan78xx 1-1:1.0 enu1: Failed to set MAC down with error -ENODEV  lan78xx 1-1:1.0 enu1: Link is Down  lan78xx 1-1:1.0 enu1: Failed to read register index 0x00000120. ret = -ENODEV  ------------[ cut here ]------------  WARNING: CPU: 0 PID: 11 at net/core/dev.c:7417 __netif_napi_del_locked+0x2b4/0x350  Modules linked in: flexcan can_dev fuse  CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 6.16.0-rc2-00624-ge926949dab03 #9 PREEMPT  Hardware name: SKOV IMX8MP CPU revC - bd500 (DT)  Workqueue: usb_hub_wq hub_event  pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)  pc : __netif_napi_del_locked+0x2b4/0x350  lr : __netif_napi_del_locked+0x7c/0x350  sp : ffffffc085b673c0  x29: ffffffc085b673c0 x28: ffffff800b7f2000 x27: ffffff800b7f20d8  x26: ffffff80110bcf58 x25: ffffff80110bd978 x24: 1ffffff0022179eb  x23: ffffff80110bc000 x22: ffffff800b7f5000 x21: ffffff80110bc000  x20: ffffff80110bcf38 x19: ffffff80110bcf28 x18: dfffffc000000000  x17: ffffffc081578940 x16: ffffffc08284cee0 x15: 0000000000000028  x14: 0000000000000006 x13: 0000000000040000 x12: ffffffb0022179e8  x11: 1ffffff0022179e7 x10: ffffffb0022179e7 x9 : dfffffc000000000  x8 : 0000004ffdde8619 x7 : ffffff80110bcf3f x6 : 0000000000000001  x5 : ffffff80110bcf38 x4 : ffffff80110bcf38 x3 : 0000000000000000  x2 : 0000000000000000 x1 : 1ffffff0022179e7 x0 : 0000000000000000  Call trace:   __netif_napi_del_locked+0x2b4/0x350 (P)   lan78xx_disconnect+0xf4/0x360   usb_unbind_interface+0x158/0x718   device_remove+0x100/0x150   device_release_driver_internal+0x308/0x478   device_release_driver+0x1c/0x30   bus_remove_device+0x1a8/0x368   device_del+0x2e0/0x7b0   usb_disable_device+0x244/0x540   usb_disconnect+0x220/0x758   hub_event+0x105c/0x35e0   process_one_work+0x760/0x17b0   worker_thread+0x768/0xce8   kthread+0x3bc/0x690   ret_from_fork+0x10/0x20  irq event stamp: 211604  hardirqs last  enabled at (211603): [<ffffffc0828cc9ec>] _raw_spin_unlock_irqrestore+0x84/0x98  hardirqs last disabled at (211604): [<ffffffc0828a9a84>] el1_dbg+0x24/0x80  softirqs last  enabled at (211296): [<ffffffc080095f10>] handle_softirqs+0x820/0xbc8  softirqs last disabled at (210993): [<ffffffc080010288>] __do_softirq+0x18/0x20  ---[ end trace 0000000000000000 ]---  lan78xx 1-1:1.0 enu1: failed to kill vid 0081/0

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.10-1 | [DEBIAN-CVE-2026-43479](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43479.md) | May 15, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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