What’s Vulnerable › Vulnerabilities

CVE-2026-90344: wifi: mac80211: disconnect on CSA to channel 0

• 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: mac80211: disconnect on CSA to channel 0 The refactor for the CSA parsing erroneously equates channel zero and no information present, leading it to ignore a CSA on an AP that advertises a switch to that (invalid) channel. This leads to not disconnecting, which we should. For Intel devices, this can lead to a firmware crash. Fix this by using an int type for the channel number as well as the opclass, and using a (negative) value that cannot be encoded in the element to indicate it's not present.

Affected products

• Linux kernel: 6.9 — 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/099aadb2012d7490bc584cc5075ef11cbc33f2c3
• https://git.kernel.org/stable/c/cf57f0a674cc3e3cda1a789359cc1238b61b9d7d
• https://git.kernel.org/stable/c/e7bc5ab93acd1c3f54feeb9fa19ead3530168090
• https://git.kernel.org/stable/c/eef374088450bb91626e133c7172b8a0e969a522

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