UBUNTU-CVE-2026-98326: Low severity ubuntu/linux vulnerability

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: mesh: release the channel if start fails ieee80211joinmesh() acquires a channel context and then calls ieee80211startmesh(), which can fail. In that case, the chanctx isn't released then interface removal will attempt to unassign it after it's removed from the driver, hitting: wlan0: Failed check-sdata-in-driver check, flags: 0x0 WARNING: net/mac80211/driver-ops.c:366 at drvunassignvifchanctx ieee80211assignlinkchanctx ieee80211linkreleasechannel ieee80211linkreleasechannel ieee80211teardownsdata unregisternetdevicemanynotify cfg80211unregisterwdev ieee80211removeinterfaces ieee80211unregisterhw mac80211hwsimdelradio hwsimexitnet Correctly release the channel on start failures.