CVE-2026-98526
Published Oct 18, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: llc: reserve device headroom for allocated frames llc_alloc_frame() reserves link-layer headroom using the device type. This is insufficient for stacked Ethernet devices such as VLAN devices, where vlan_dev_hard_header() pushes a VLAN header before the lower device's Ethernet header. An LLC response on such a device can therefore underflow skb headroom in eth_header(). Use LL_RESERVED_SPACE() to account for the device's actual required headroom while preserving the existing LLC device-type check.
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References
Other References
https://git.kernel.org/stable/c/018020f5a48cc86fdd6dc2d380f6c70443ae7639
https://git.kernel.org/stable/c/16ceac2daa89dd16917bc488ab05b9dd6961a603
https://git.kernel.org/stable/c/1937222c2511ac91377d39f28106c34734f5f8c6
https://git.kernel.org/stable/c/3361c93e417384ebf28003e0fb6d5304653d3b05
https://git.kernel.org/stable/c/3a3f57c4061d9e9cc3bc04205d36ce41ae3406c1
https://git.kernel.org/stable/c/72b5b9a28b996e09b8b5b944370c79851bb68f52
https://git.kernel.org/stable/c/7c38524b2b2456bd33cb360420da6cbf9cad1b33
https://git.kernel.org/stable/c/e06f8b6e27cc616d3c587e9784c4a033eb310a16
Frequently Asked Questions
What is CVE-2026-98526? +
In the Linux kernel, the following vulnerability has been resolved:
llc: reserve device headroom for allocated frames
llc_alloc_frame() reserves link-layer headroom using the device type.
This is insufficient for stacked Ethernet devices such as VLAN devices,
where vlan_dev_hard_header() pushes a VLAN header before the lower
device's Ethernet header. An LLC response on such a device can
therefore underflow skb headroom in eth_header().
Use LL_RESERVED_SPACE() to account for the device's actual required
headroom while preserving the existing LLC device-type check.
How do I check if I'm vulnerable to CVE-2026-98526? +
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.