CVE-2026-23083
Last modified
CVE-2026-23083 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.13% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 3.18, < 5.10.249 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.199 | — |
| Linux | Linux Kernel | >= 5.16, < 6.1.162 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.122 | — |
| Linux | Linux Kernel | >= 6.7, < 6.12.68 | — |
| Linux | Linux Kernel | >= 6.13, < 6.18.8 | — |
| Linux | Linux Kernel | 6.19 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-23083?
How severe is CVE-2026-23083?
How do I fix CVE-2026-23083?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-23077In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-23078In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2026-23079In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23080In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23081In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23082In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23084In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23085In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23086In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23087In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23088In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2026-23089In the Linux kernel, the following vulnerability has been re…7.8
Are you affected by CVE-2026-23083?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST