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CVE-2026-43167

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: xfrm: always flush state and policy upon NETDEV_UNREGISTER event syzbot is reporting that "struct xfrm_state" refcount is leaking.

Published May 6, 2026EPSS 0.16%

Overview

CVE-2026-43167 is a medium-severity vulnerability. It was published on May 6, 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:

xfrm: always flush state and policy upon NETDEV_UNREGISTER event

syzbot is reporting that "struct xfrm_state" refcount is leaking.

unregister_netdevice: waiting for netdevsim0 to become free. Usage count = 2

ref_tracker: netdev@ffff888052f24618 has 1/1 users at

__netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]

netdev_tracker_alloc include/linux/netdevice.h:4412 [inline]

xfrm_dev_state_add+0x3a5/0x1080 net/xfrm/xfrm_device.c:316

xfrm_state_construct net/xfrm/xfrm_user.c:986 [inline]

xfrm_add_sa+0x34ff/0x5fa0 net/xfrm/xfrm_user.c:1022

xfrm_user_rcv_msg+0x58e/0xc00 net/xfrm/xfrm_user.c:3507

netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550

xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3529

netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]

netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344

netlink_s

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/166801e49a5b5fc127b8c9e2f110f303cfddfbc3Refgit.kernel.org/stable/c/4efa91a28576054aae0e6dad9cba8fed8293aef8Refgit.kernel.org/stable/c/59581778792cbaf8ad788f4a21dc663ce986050eRefgit.kernel.org/stable/c/8c75c455ecd3bfd2f36abf66edb7021c4fa19ec4Refgit.kernel.org/stable/c/a3c8fede034fa27892f87c863cbd5493167d17ed

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43167?

CVE-2026-43167 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43167?

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-2026-43167?

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-2026-43167?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43167 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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