CVE-2026-98424

What it actually does

The cfg80211 code performs a netns switch on the wiphy after moving interfaces, but on rename failure (due to allocation error) it leaves the wiphy in a mixed namespace state instead of rolling back the switch, triggering warnings.

Why it matters to the business

Wireless networking on Linux systems using network namespaces may encounter instability or warnings during interface management operations under low-memory conditions, with low overall operational risk given the narrow trigger.

How an attack unfolds

An attacker would need local access or the ability to trigger cfg80211 netns operations followed by an allocation failure during wiphy rename; the resulting inconsistent state is primarily a stability issue rather than a direct code-execution vector, and no public exploitation has been observed.

How to fix it

Apply the upstream kernel fix that restores the original namespace on rename failure; monitor for distribution backports to the affected kernel versions.

How to confirm the fix worked

Confirm the patch is present by inspecting the cfg80211_switch_netns function for the added undo logic on rename failure; test by inducing allocation pressure during netns rename operations.

Typical attack path

1. Obtain ability to invoke cfg80211 netns switching (local or privileged context)
2. Force an allocation failure during the wiphy rename step
3. Observe resulting namespace inconsistency and kernel warning

How to detect it

Search kernel logs for warnings emitted from cfg80211 netns handling around wiphy rename or namespace operations; no remote indicators are expected.

What your security team should do

• Prioritize patching Linux kernels that include wireless cfg80211 support once fixes are released by distributions
• Review any custom code or tools that perform frequent netns switches on Wi-Fi interfaces for robustness
• Monitor kernel logs for warnings related to wiphy namespace moves