Linux: mac80211_hwsim OUT-OF-BOUND read via undersized NL attr
CVE-2026-98887 Published on October 23, 2026
wifi: mac80211_hwsim: reject undersized HWSIM_ATTR_TX_INFO
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.
Products Associated with CVE-2026-98887
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Affected Versions
Linux:- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 3a96bb65b4b820d8b41fa155781ec1c29e3479d4 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 59e1f2a0242232b4a3af144ae317d3913fc09046 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 1ae85bb34fe3510659b86d6a5f8036dd498233f8 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below b5b1234bbfa25537fb9a5c0d62c328ed4547f721 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7 is affected.
- Version 5d44fe7c9808c56e136e59147bd932f5491520f1 and below 3dc723ac78a6e4fa0fd49e27e487ed319da40a9f is affected.
- Version 5.7 is affected.
- Before 5.7 is unaffected.
- Version 5.10.271, <= 5.10.* is unaffected.
- Version 5.15.222, <= 5.15.* is unaffected.
- Version 6.1.189, <= 6.1.* is unaffected.
- Version 6.6.158, <= 6.6.* is unaffected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2, <= * is unaffected.