Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling Move the freeing of the dummy net_device from mtk_free_dev() to mtk_remove(). Previously, if alloc_netdev_dummy() failed in mtk_probe(), eth->dummy_dev would be NULL. The error path would then call mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev was allocated (but it was not), potentially causing a NULL pointer dereference. By moving free_netdev() to mtk_remove(), we ensure it's only called when mtk_probe() has succeeded and dummy_dev is fully allocated. This addresses a potential NULL pointer dereference detected by Smatch[1].

Affected versions

Linux: d5d57501f543f48df8b76a4af59def9a894b396f through before 81e82340170ae82f8cc28e76c13a0069c0d47cb4 (git); b209bd6d0bffb8991aba568e2d9a892c86a1a43c through before af6bd5c9901b13a26eaf4d57d97a813297791596 (git); b209bd6d0bffb8991aba568e2d9a892c86a1a43c through before 16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef (git); 6.10 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.