CVE-2026-80681

Description

In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

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EPSS — Exploit Prediction

0.0018

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5 https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5 https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555 https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56 https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4 https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a

Frequently Asked Questions

What is CVE-2026-80681? +

In the Linux kernel, the following vulnerability has been resolved: vxlan: re-fetch eth header after route_shortcircuit() Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb). Inside route_shortcircuit(), pskb_may_pull() can be called, which may reallocate skb->head. In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to freed memory, leading to a use-after-free when dereferencing eth->h_dest. Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

How do I check if I'm vulnerable to CVE-2026-80681? +

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.