UBUNTU-CVE-2026-89524: High severity ubuntu/linux vulnerability
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6klcfg80211connectevent() subtracts fixed IE offsets from assocreqlen (-= 4) and assocresplen (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6klwmiconnecteventrx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211connectresult() / cfg80211roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small associnfo buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1119.126~20.04.1 - Upgrade
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ubuntu/linux-gcp-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1120.130~20.04.1 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1 - Compensating control
In the Linux kernel ath6kl_cfg80211_connect_event() path, clamp assoc_req_len to at least its fixed IE offset of 4 and assoc_resp_len to at least its fixed IE offset of 6 before subtracting those offsets.