CVE-2026-98887
Published Oct 23, 2026
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.
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References
Other References
https://git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7
https://git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8
https://git.kernel.org/stable/c/3a96bb65b4b820d8b41fa155781ec1c29e3479d4
https://git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f
https://git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046
https://git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695
https://git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721
Frequently Asked Questions
What is CVE-2026-98887? +
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.
How do I check if I'm vulnerable to CVE-2026-98887? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.