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CVE-2026-23003

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv() Blamed commit did not take care of VLAN encapsulations as spotted by…

Published Jan 25, 2026CWE-908EPSS 0.56%

Overview

CVE-2026-23003 is a high-severity vulnerability. It was published on January 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()

Blamed commit did not take care of VLAN encapsulations

as spotted by syzbot [1].

Use skb_vlan_inet_prepare() instead of pskb_inet_may_pull().

[1]

BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]

BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]

BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321

__INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]

INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]

IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321

ip6ip6_dscp_ecn_decapsulate+0x16f/0x1b0 net/ipv6/ip6_tunnel.c:729

__ip6_tnl_rcv+0xed9/0x1b50 net/ipv6/ip6_tunnel.c:860

ip6_tnl_rcv+0xc3/0x100 net/ipv6/ip6_tunnel.c:903

gre_rcv+0x1529/0x1b90 net/ipv6/ip6_gre.c:-1

ip6_protocol_deliver_rcu+0x1c89/0x2c60 net/ipv6/ip6_input

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2f03dafea0a8096a2eb60f551218b360e5bab9a3Refgit.kernel.org/stable/c/64c71d60a21a9ed0a802483dcd422b5b24eb1abeRefgit.kernel.org/stable/c/81c734dae203757fb3c9eee6f9896386940776bdRefgit.kernel.org/stable/c/9e1c8c2a33d0a7b1f637b5d0602fe56ed10166afRefgit.kernel.org/stable/c/b9f915340f25cae1562f18e1eb52deafca328414Refgit.kernel.org/stable/c/df5ffde9669314500809bc498ae73d6d3d9519acRefgit.kernel.org/stable/c/f9c5c5b791d3850570796f9e067629474e613796Refcert-portal.siemens.com/productcert/html/ssa-019113.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23003?

CVE-2026-23003 is a high-severity vulnerability. It was published on January 25, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-23003?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-23003?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-23003?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23003 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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