CVE-2026-90366

high

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a near-maximum beacon template the extra 8 bytes could push the offload command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic(). Reserve room for both countdown TLVs.

References

https://git.kernel.org/stable/c/bc1d694a1ffe0062c3adf0db1d64ad54454398ec

https://git.kernel.org/stable/c/50c66bab321140c49aa2ed779a3ec9d2f085b458

https://git.kernel.org/stable/c/45d8896e4cffffb2c6554ccbec6efe7a0d53166f

https://git.kernel.org/stable/c/1d348f96623ec20d700af7d4dfc00a74da6238ac

https://git.kernel.org/stable/c/1a51aff0e048dc5b8252d65808b79939c942d6ec

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-82027

Details

Source: Mitre, NVD

Published: 2026-09-17

Updated: 2026-10-19

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 8.4

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00168