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CVE-2026-23203

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: cpsw_new: Execute ndo_set_rx_mode callback in a work queue Commit 1767bb2d47b7 ("ipv6: mcast: Don't hold RTNL for IPV6_ADD…

Published Feb 14, 2026EPSS 0.12%

Overview

CVE-2026-23203 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

net: cpsw_new: Execute ndo_set_rx_mode callback in a work queue

Commit 1767bb2d47b7 ("ipv6: mcast: Don't hold RTNL for

IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP.") removed the RTNL lock for

IPV6_ADD_MEMBERSHIP and MCAST_JOIN_GROUP operations. However, this

change triggered the following call trace on my BeagleBone Black board:

WARNING: net/8021q/vlan_core.c:236 at vlan_for_each+0x120/0x124, CPU#0: rpcbind/496

RTNL: assertion failed at net/8021q/vlan_core.c (236)

Modules linked in:

CPU: 0 UID: 997 PID: 496 Comm: rpcbind Not tainted 6.19.0-rc6-next-20260122-yocto-standard+ #8 PREEMPT

Hardware name: Generic AM33XX (Flattened Device Tree)

Call trace:

unwind_backtrace from show_stack+0x28/0x2c

show_stack from dump_stack_lvl+0x30/0x38

dump_stack_lvl from __warn+0xb8/0x11c

__warn from warn_slowpath_fmt+0x130/0x194

warn_slowpath_fmt from vlan_for_each+0x120/0x124

vlan_for_each from cpsw_add_mc_ad

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/c0b5dc73a38f954e780f93a549b8fe225235c07aRefgit.kernel.org/stable/c/d5b3a669866977dc87fd56fcf00a70df1536d258

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23203?

CVE-2026-23203 is a medium-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23203?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23203?

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-2026-23203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23203 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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