CVE-2026-90372

Wireless service interruption via NSS underflow

Published Sep 17, 2026 · Updated Sep 18, 2026

Integer underflow in Linux's mt7915 Wi-Fi driver allows physically proximate attackers to crash or hang an access point's radio. mt7915_mcu_get_sta_nss returns 255 when an untrusted VHT/HE MCS map advertises no supported spatial stream, and that value is written into firmware beamforming fields. An unauthenticated 802.11 peer within radio range can trigger the path during association before the WPA handshake and can repeat it after recovery.

CVSS severity7.1
High
EPSS probability0.36%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Linux's mt7915 Wi-Fi driver allows physically proximate attackers to crash or hang an access point's radio. mt7915_mcu_get_sta_nss returns 255 when an untrusted VHT/HE MCS map advertises no supported spatial stream, and that value is written into firmware beamforming fields. An unauthenticated 802.11 peer within radio range can trigger the path during association before the WPA handshake and can repeat it after recovery.

The record

CVE
CVE-2026-90372
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.8
  2. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <25f753f7f620955a8a51e63e445d8b9076c51396
  3. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <2801477c36a19be4f549fe60e54995f03b0ea7b9
  4. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <38f4d6323bcd65e41a691432eddabd2b03acdeee
  5. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <4a2f4be532e3ea4e2b536e411793a05aaa51af25
  6. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7
  7. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <85bd46ab7674b6d357f9a14791352c65fb09eee9
  8. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6
  9. Affected versionversion=89029a85482cbcf68026a89fc974e8f6898d6b37 <ecfd1a07e78c31d81322fb2d81dc468081cc3004

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <25f753f7f620955a8a51e63e445d8b9076c51396; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <2801477c36a19be4f549fe60e54995f03b0ea7b9; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <38f4d6323bcd65e41a691432eddabd2b03acdeee; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <4a2f4be532e3ea4e2b536e411793a05aaa51af25; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <85bd46ab7674b6d357f9a14791352c65fb09eee9; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6; version=89029a85482cbcf68026a89fc974e8f6898d6b37 <ecfd1a07e78c31d81322fb2d81dc468081cc3004

Published CVSS scores

7.1Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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