CVE-2025-39876: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable() The function of_phy_find_device may return NULL, so we need to take care before dereferencing phy_dev.

Affected products

• Debian Debian Linux: version 11.0 only
• Linux Linux Kernel: from 4.19.153, before 4.20 (fixed in 4.20); from 5.4.73, before 5.4.300 (fixed in 5.4.300); from 5.8.17, before 5.9 (fixed in 5.9); from 5.9.2, before 5.10.245 (fixed in 5.10.245); from 5.11, before 5.15.194 (fixed in 5.15.194); from 5.16, before 6.1.153 (fixed in 6.1.153); …

Published 2025-09-23. Last modified 2026-06-17.