Integer underflow in Linux kernel - CVE-2026-90372
Published: September 18, 2026
Vulnerability identifier: #VU151113
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90372
CWE-ID: CWE-191
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause an out-of-range spatial-stream value to be written to firmware beamforming fields.
The vulnerability exists due to an integer underflow in mt7915_mcu_get_sta_nss when processing a peer VHT/HE MCS map with no supported spatial streams. A remote attacker can advertise a crafted VHT/HE MCS map to cause an out-of-range spatial-stream value to be written to firmware beamforming fields.
Affected software
Linux kernel
How to mitigate CVE-2026-90372
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396
- https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9
- https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee
- https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25
- https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7
- https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9
- https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6
- https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004