CVE-2026-98887 wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-98887?
CVE-2026-98887 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO
hwsim_tx_info_frame_received_nl() casts the HWSIM_ATTR_TX_INFO payload to a struct hwsim_tx_rate * and unconditionally reads IEEE80211_TX_MAX_RATES entries (8 bytes) from it. The policy only bounds the attribute from above (NLA_BINARY .len is a maximum) and the op sets GENL_DONT_VALIDATE_STRICT, so a short or zero-length attribute is accepted and the loop reads past the payload.
Require the exact length in the policy, so a malformed attribute is rejected before the handler runs.
Which versions are affected by CVE-2026-98887?
How do I fix CVE-2026-98887?
Upgrade to a fixed version.
Is CVE-2026-98887 being exploited?
There is no known exploitation of CVE-2026-98887 in the wild and no public exploit code.
Sources
Also known as AZL-110626, BELL-CVE-2026-98887, DEBIAN-CVE-2026-98887, GHSA-vjmv-qr7m-gc5q, UBUNTU-CVE-2026-98887.