CVE-2026-98890
Published Oct 23, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: reject short monitor TX frames In monitor mode, lbs_hard_start_xmit() casts skb->data to a radiotap TX header, skips that header, and then copies the 802.11 destination address from offset 4 in the remaining frame. The generic length check only rejects zero-length and oversized skbs, so a short monitor frame can be read past the end of the skb data. Require enough bytes for the radiotap TX header and the destination address field before using the monitor-mode header layout.
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References
Other References
https://git.kernel.org/stable/c/13ff543e0b2c713aedeaadadde686686e949dc78
https://git.kernel.org/stable/c/443fac3de65c76544b450b9f9903be8989150d55
https://git.kernel.org/stable/c/6576baa3fdbaa91fa75e4ba27095f4b8a27349a8
https://git.kernel.org/stable/c/68c92c991ddb75dfd3fd62a94a1d4d2dde44dc3c
https://git.kernel.org/stable/c/b657cc98d7936c5d9ed7e0e1944ad0e1f36375bb
https://git.kernel.org/stable/c/cdcfd662c67833d89ee3d912efde2eb67c8a7326
https://git.kernel.org/stable/c/d865dd6de8295f2bfaa83f0f5d49d2bef1543065
Frequently Asked Questions
What is CVE-2026-98890? +
In the Linux kernel, the following vulnerability has been resolved:
wifi: libertas: reject short monitor TX frames
In monitor mode, lbs_hard_start_xmit() casts skb->data to a
radiotap TX header, skips that header, and then copies the 802.11
destination address from offset 4 in the remaining frame. The
generic length check only rejects zero-length and oversized skbs, so
a short monitor frame can be read past the end of the skb data.
Require enough bytes for the radiotap TX header and the destination
address field before using the monitor-mode header layout.
How do I check if I'm vulnerable to CVE-2026-98890? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.