CVE-2025-39978: Linux

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: octeontx2-pf: Fix potential use after free in otx2_tc_add_flow() This code calls kfree_rcu(new_node, rcu) and then dereferences "new_node" and then dereferences it on the next line. Two lines later, we take a mutex so I don't think this is an RCU safe region. Re-order it to do the dereferences before queuing up the free.

Affected products

• Linux Linux: from 5.14, before 6.1.155 (fixed in 6.1.155); from 6.2, before 6.6.109 (fixed in 6.6.109); from 6.7, before 6.12.50 (fixed in 6.12.50); from 6.13, before 6.16.10 (fixed in 6.16.10)
• Siemens SIMATIC s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.6
• Siemens SIMATIC s7-1500 CPU 1518f-4 Pn/dp Mfp: from V3.1.6
• Siemens Siplus s7-1500 CPU 1518-4 Pn/dp Mfp: from V3.1.6

Published 2025-10-15. Last modified 2026-07-30.