CVE-2025-39805

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: macb: fix unregister_netdev call order in macb_remove()

When removing a macb device, the driver calls phy_exit() before unregister_netdev(). This leads to a WARN from kernfs:

————[ cut here ]———— kernfs: can not remove 'attached_dev', no directory WARNING: CPU: 1 PID: 27146 at fs/kernfs/dir.c:1683 Call trace: kernfs_remove_by_name_ns+0xd8/0xf0 sysfs_remove_link+0x24/0x58 phy_detach+0x5c/0x168 phy_disconnect+0x4c/0x70 phylink_disconnect_phy+0x6c/0xc0 [phylink] macb_close+0x6c/0x170 [macb] … macb_remove+0x60/0x168 [macb] platform_remove+0x5c/0x80 …

The warning happens because the PHY is being exited while the netdev is still registered. The correct order is to unregister the netdev before shutting down the PHY and cleaning up the MDIO bus.

Fix this by moving unregister_netdev() ahead of phy_exit() in macb_remove().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8b73fa3ae02b2401960de41b0454c0321377b203 < 7351782f2fc8ac31ced52e3d4e6fa120f819a7abaffected
LinuxLinux8b73fa3ae02b2401960de41b0454c0321377b203 < 2b9719ccad38dffad7dbdd2f39896f723f9b9011affected
LinuxLinux8b73fa3ae02b2401960de41b0454c0321377b203 < ff0d3bad32108b57265e5b48f15327549af771d3affected
LinuxLinux8b73fa3ae02b2401960de41b0454c0321377b203 < 775fe690fd4a3337ad2115de2adb41b227d4dae7affected
LinuxLinux8b73fa3ae02b2401960de41b0454c0321377b203 < 01b9128c5db1b470575d07b05b67ffa3cb02ebf1affected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.1.159 <= 6.1.*unaffected
LinuxLinux6.6.119 <= 6.6.*unaffected
LinuxLinux6.12.45 <= 6.12.*unaffected
LinuxLinux6.16.5 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

References