What’s Vulnerable › Vulnerabilities

CVE-2026-98526: llc: reserve device headroom for allocated frames

• 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: 2026-10-18 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.34 — 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/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

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