Heap-based buffer overflow in Linux kernel - CVE-2026-64446
Published: July 27, 2026
Vulnerability identifier: #VU139493
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64446
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to a heap-based buffer overflow in rtw_cfg80211_set_wpa_ie() when handling a crafted WPA or WPA2 information element in a connect request via nl80211. A local user can send a specially crafted connect request to cause memory corruption.
The issue can overflow the 256-byte supplicant_ie buffer by one byte into the adjacent last_mic_err_time field.
Affected software
Linux kernel
How to mitigate CVE-2026-64446
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/138cd190efd56ab36c9fdd8fef8749d06937f24b
- https://git.kernel.org/stable/c/2131621986c62c86109ce4d84cf73a73757eb8a6
- https://git.kernel.org/stable/c/46f66c16a95191d9aca07a72ae6b1252a244e26c
- https://git.kernel.org/stable/c/5a752a616e756844388a1a45404db9fc29fec655
- https://git.kernel.org/stable/c/5d7812360abf3143afcbf5efe4ef242448fa1f28
- https://git.kernel.org/stable/c/6f20d7b0ee47c470734a69379b0fc6647c519603
- https://git.kernel.org/stable/c/a94a643a80a84ceb8139061c3d6bf988d75e45a5
- https://git.kernel.org/stable/c/b9c4bf133c3c47e23baf4f5403b98a953bf58606