CVE-2025-39978: octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-15 · updated 2026-10-19

Description

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 kernel: 5.14 — fixed in 6.17

How to fix

Upgrade to a fixed version: Linux kernel 6.17. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/5723120423a753a220b8b2954b273838b9d7e74a
https://git.kernel.org/stable/c/a8a63f27c3a8a3714210d32b12fd0f16d0337414
https://git.kernel.org/stable/c/c41b2941a024d4ec7c768e16ffb10a74b188fced
https://git.kernel.org/stable/c/d9c70e93ec5988ab07ad2a92d9f9d12867f02c56
https://git.kernel.org/stable/c/df2c071061ed52d2225d97b212d27ecedf456b8a
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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