Security Advisory

CVE-2026-63993

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-19 14:56:13

Last updated 2026-07-20 13:42:08

Assigner Linux

CVSS score 9.8

State PUBLISHED

Description

In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.

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