CVE-2026-89524

In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() 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 cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info 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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc
https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613
https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9
https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a
https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605
https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb
https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815
https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-14 13:19

NVD link : CVE-2026-89524

Mitre link : CVE-2026-89524

CVE.ORG link : CVE-2026-89524

JSON object : View

Products Affected

No product.

CWE

No CWE.

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The aggregate check recently added to ath6kl_wmi_connect_event_rx()\nbounds the declared lengths from above (their sum must fit the received\nevent), but an assoc request/response shorter than its fixed offset still\nunderflows here: the u8 wraps to ~250, and cfg80211_connect_result() /\ncfg80211_roamed() then treat that wrapped value as the IE length and copy\nthat many bytes out of the small assoc_info buffer to user space via\nnl80211, disclosing adjacent slab memory.\n\nClamp both lengths to their offsets before subtracting.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing lower bound is evident from source. Compile-tested."}], "lastModified": "2026-09-14T13:19:08.113", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}