Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: mesh: release the channel if start fails ieee80211_join_mesh() acquires a channel context and then calls ieee80211_start_mesh(), 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 drv_unassign_vif_chanctx ieee80211_assign_link_chanctx __ieee80211_link_release_channel ieee80211_link_release_channel ieee80211_teardown_sdata unregister_netdevice_many_notify _cfg80211_unregister_wdev ieee80211_remove_interfaces ieee80211_unregister_hw mac80211_hwsim_del_radio hwsim_exit_net Correctly release the channel on start failures.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund5 Oct 2026WID-SEC-2026-3743

  Linux Kernel: Multiple vulnerabilities Translated from German

  Risk mediumCVE-2026-98221CVE-2026-98181CVE-2026-98248+204 more CVEs

[ References ]References

• git.kernel.org/stable/c/41bee71112db53651ba9a9030de1b843255a4a7f
• git.kernel.org/stable/c/4a4e3fa77ea36d3419d806fb5883ef425a605a5d
• git.kernel.org/stable/c/632f7acfe6dac1278a9314eaaab14fada400ddaf
• git.kernel.org/stable/c/ae97fff6495a8764bc0ef281cfe5444f701e527f
• git.kernel.org/stable/c/b51f5a310bd6888b90bb9546a8081215dcfe6fbe
• git.kernel.org/stable/c/f0afcec2129c166e61821d6ae097061155f01b12