CVE-2026-43110 wifi: brcmfmac: validate bsscfg indices in IF events
A missing bounds check in the brcmfmac Wi-Fi driver allows out-of-bounds array access, potentially causing a system crash or denial of service.
- 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-2026-43110?
CVE-2026-43110 is a high-severity vulnerability in Linux kernel, published on 6 May 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: brcmfmac: validate bsscfg indices in IF events
brcmf_fweh_handle_if_event() validates the firmware-provided interface index before it touches drvr->iflist[], but it still uses the raw bsscfgidx field as an array index without a matching range check.
Reject IF events whose bsscfg index does not fit in drvr->iflist[] before indexing the interface array.
[add missing wifi prefix]
Weakness: CWE-129
Which versions are affected by CVE-2026-43110?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43110?
Apply the vendor's patch.
Is CVE-2026-43110 being exploited?
There is no known exploitation of CVE-2026-43110 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43110, DEBIAN-CVE-2026-43110, GHSA-24vc-pxrh-rpjv, ROOT-OS-DEBIAN-11-CVE-2026-43110, ROOT-OS-DEBIAN-12-CVE-2026-43110, ROOT-OS-UBUNTU-2204-CVE-2026-43110 and 2 more.