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CVE-2026-23124

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ipv6: annotate data-race in ndisc_router_discovery() syzbot found that ndisc_router_discovery() could read and write in6_dev->r…

Published Feb 14, 2026EPSS 0.13%

Overview

CVE-2026-23124 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:

ipv6: annotate data-race in ndisc_router_discovery()

syzbot found that ndisc_router_discovery() could read and write

in6_dev->ra_mtu without holding a lock [1]

This looks fine, IFLA_INET6_RA_MTU is best effort.

Add READ_ONCE()/WRITE_ONCE() to document the race.

Note that we might also reject illegal MTU values

(mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) in a future patch.

[1]

BUG: KCSAN: data-race in ndisc_router_discovery / ndisc_router_discovery

read to 0xffff888119809c20 of 4 bytes by task 25817 on cpu 1:

ndisc_router_discovery+0x151d/0x1c90 net/ipv6/ndisc.c:1558

ndisc_rcv+0x2ad/0x3d0 net/ipv6/ndisc.c:1841

icmpv6_rcv+0xe5a/0x12f0 net/ipv6/icmp.c:989

ip6_protocol_deliver_rcu+0xb2a/0x10d0 net/ipv6/ip6_input.c:438

ip6_input_finish+0xf0/0x1d0 net/ipv6/ip6_input.c:489

NF_HOOK include/linux/netfilter.h:318 [inline]

ip6_input+0x5e/0x140 net/ipv6/ip6_input.c:500

ip6_mc_input+0x27c/0x470 net/ipv6/ip6_i

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/2619499169fb1c2ac4974b0f2d87767fb543582bRefgit.kernel.org/stable/c/2a2b9d25f801afecf2f83cacce98afa8fd73e3c9Refgit.kernel.org/stable/c/4630897eb1a039b5d7b737b8dc9521d9d4b568b5Refgit.kernel.org/stable/c/9a063f96d87efc3a6cc667f8de096a3d38d74bb5Refgit.kernel.org/stable/c/e3c1040252e598f7b4e33a42dc7c38519bc22428Refgit.kernel.org/stable/c/fad8f4ff7928f4d52a062ffdcffa484989c79c47

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23124?

CVE-2026-23124 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-2026-23124?

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-2026-23124?

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-2026-23124?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23124 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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