CVE-2026-80681

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 6375093eb45cd7d89f1945f939eeae3b29d79f56affected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 1b7f7b653e3557690047c62f03b80a24ea5a58a5affected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < bf045341dfb3e767f0ff94cf240ce3c371973bd4affected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 2355c8c26d2aa1b4385b369e67202e47d460d555affected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585affected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 1235e017aa11cf01e91b613c4c5ed6aa28934fffaffected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < c9dceac9e1c7c772c43c732fc0d325e72835801aaffected
LinuxLinuxae8840825605f36f98f247323edc150e761cb64e < 1395a676ec15a0a02a2a6d86602324f2d5fd41d5affected
LinuxLinux3.10affected
LinuxLinux0 < 3.10unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References