Executive brief
A technical issue was identified in the Linux kernel's libwx network driver, which handles certain Wangxun Ethernet adapters. The driver was incorrectly configuring interrupt requests, which could lead to system warnings or instability during network operations. This has been resolved in recent kernel updates to ensure reliable network connectivity and system performance.
Technical details
A vulnerability (or stability issue) was identified in the libwx driver within the Linux kernel's Wangxun Ethernet support. The root cause was the incorrect use of request_threaded_irq() for Virtual Function (VF) miscellaneous interrupts. Specifically, the driver passed a NULL threaded handler while setting the IRQF_ONESHOT flag, a combination that triggers a kernel warning in __setup_irq. An attacker with local access or the ability to trigger specific network events might cause system instability or log flooding. The fix involves migrating to request_irq() and removing the unnecessary IRQF_ONESHOT flag in drivers/net/ethernet/wangxun/libwx/wx_vf_common.c.
Affected products
- Linux Linux Kernel libwx driver
Timeline
- 2026-04-29: other: Patch submitted by Jiawen Wu
- 2026-06-08: disclosed: CVE published