CVE-2026-98335 wifi: mac80211: abort chanswitch when leaving a mesh
A null pointer dereference in the Linux kernel's mac80211 mesh networking code causes a system crash when leaving a mesh network during a channel switch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98335?
CVE-2026-98335 is a vulnerability in Linux, published on 6 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: abort chanswitch when leaving a mesh
The code in ieee80211_stop_mesh() leaves CSA active, but leaving the mesh released the channel context, so the CSA finalize work crashes:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003 KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] RIP: 0010:ieee80211_put_srates_elem+0x42/0x640 net/mac80211/util.c:3272 Call Trace: ieee80211_mesh_build_beacon+0xa83/0x1b50 net/mac80211/mesh.c:1093 ieee80211_mesh_rebuild_beacon+0xc7/0x170 net/mac80211/mesh.c:1147 ieee80211_mesh_finish_csa+0x131/0x210 net/mac80211/mesh.c:1542 ieee80211_set_after_csa_beacon net/mac80211/cfg.c:4085 [inline] __ieee80211_csa_finalize net/mac80211/cfg.c:4133 [inline] ieee80211_csa_finalize+0x633/0x1150 net/mac80211/cfg.c:4155 cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438
Abort the channel switch properly.
Which versions are affected by CVE-2026-98335?
How do I fix CVE-2026-98335?
Apply the vendor's patch.
Is CVE-2026-98335 being exploited?
There is no known exploitation of CVE-2026-98335 in the wild and no public exploit code.
Sources
Also known as AZL-106065, BELL-CVE-2026-98335, DEBIAN-CVE-2026-98335, GHSA-wmxc-8xr9-g2qr, UBUNTU-CVE-2026-98335.