CVE-2026-23083
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
Analysis
Local privilege escalation in the Linux kernel's FOU (Foo-over-UDP) tunnel implementation allows authenticated local users to trigger a memory leak and denial of service by setting the FOU_ATTR_IPPROTO attribute to zero, causing network packets to remain unfreed in memory. This vulnerability affects all Linux systems with the vulnerable kernel code and requires local access to exploit. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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