What’s Vulnerable › Vulnerabilities

CVE-2026-90366: wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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: 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.

Affected products

• Linux kernel: 6.2 — 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/1a51aff0e048dc5b8252d65808b79939c942d6ec
• https://git.kernel.org/stable/c/1d348f96623ec20d700af7d4dfc00a74da6238ac
• https://git.kernel.org/stable/c/45d8896e4cffffb2c6554ccbec6efe7a0d53166f
• https://git.kernel.org/stable/c/50c66bab321140c49aa2ed779a3ec9d2f085b458
• https://git.kernel.org/stable/c/bc1d694a1ffe0062c3adf0db1d64ad54454398ec

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