Vulnerability in Linux

[ Description ]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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• git.kernel.org/stable/c/13edd8ea7ff2ce6a964b290ef2034cd8cbed96c7
• git.kernel.org/stable/c/1ae85bb34fe3510659b86d6a5f8036dd498233f8
• git.kernel.org/stable/c/3a96bb65b4b820d8b41fa155781ec1c29e3479d4
• git.kernel.org/stable/c/3dc723ac78a6e4fa0fd49e27e487ed319da40a9f
• git.kernel.org/stable/c/59e1f2a0242232b4a3af144ae317d3913fc09046
• git.kernel.org/stable/c/6f6368b20f8c9481fa7ba7b672dcb3c9f36b2695
• git.kernel.org/stable/c/b5b1234bbfa25537fb9a5c0d62c328ed4547f721