CVE-2026-80681 is a vulnerability in Linux Kernel
Published on August 28, 2026
vxlan: re-fetch eth header after route_shortcircuit()
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().
Products Associated with CVE-2026-80681
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Affected Versions
Linux:- Version ae8840825605f36f98f247323edc150e761cb64e and below 6375093eb45cd7d89f1945f939eeae3b29d79f56 is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below 1b7f7b653e3557690047c62f03b80a24ea5a58a5 is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below bf045341dfb3e767f0ff94cf240ce3c371973bd4 is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below 2355c8c26d2aa1b4385b369e67202e47d460d555 is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below 1235e017aa11cf01e91b613c4c5ed6aa28934fff is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below c9dceac9e1c7c772c43c732fc0d325e72835801a is affected.
- Version ae8840825605f36f98f247323edc150e761cb64e and below 1395a676ec15a0a02a2a6d86602324f2d5fd41d5 is affected.
- Version 3.10 is affected.
- Before 3.10 is unaffected.
- Version 5.10.265, <= 5.10.* is unaffected.
- Version 5.15.216, <= 5.15.* is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.