What’s Vulnerable › Vulnerabilities

CVE-2026-80681: vxlan: re-fetch eth header after route_shortcircuit()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-16

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().

Affected products

• Linux kernel: 3.10 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

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

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