CVEvulnerability
CVE-2026-80681
9.8 CRITICAL
Official page ↗
- Status
- Received
- Published
- 2026-08-28
- Last modified
- 2026-10-16
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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().
References
- https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff git.kernel.org
- https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5 git.kernel.org
- https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585 git.kernel.org
- https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5 git.kernel.org
- https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555 git.kernel.org
- https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56 git.kernel.org
- https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4 git.kernel.org
- https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a git.kernel.org