CVE-2026-23246 wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration
An out-of-bounds write in the Linux kernel Wi-Fi subsystem allows attackers to potentially execute code or escalate privileges via crafted ML Reconfiguration elements.
- 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-2026-23246?
CVE-2026-23246 is a high-severity memory corruption vulnerability in Linux kernel, published on 18 Mar 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: bounds-check link_id in ieee80211_ml_reconfiguration
link_id is taken from the ML Reconfiguration element (control & 0x000f), so it can be 0..15. link_removal_timeout[] has IEEE80211_MLD_MAX_NUM_LINKS (15) elements, so index 15 is out-of-bounds. Skip subelements with link_id >= IEEE80211_MLD_MAX_NUM_LINKS to avoid a stack out-of-bounds write.
Weakness: CWE-129
Which versions are affected by CVE-2026-23246?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23246?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23246 being exploited?
There is no known exploitation of CVE-2026-23246 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-79995, BELL-CVE-2026-23246, DEBIAN-CVE-2026-23246, GHSA-g43x-jrqr-j62r, ROOT-OS-DEBIAN-13-CVE-2026-23246, ROOT-OS-UBUNTU-2404-CVE-2026-23246 and 1 more.