What’s Vulnerable › Vulnerabilities

CVE-2026-90372: wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss If a peer's VHT/HE MCS map has no supported spatial stream (all fields 0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255), which was then written into the firmware sta_rec_bf beamforming fields. Clamp the result to 0.

Affected products

• Linux kernel: 5.8 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

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