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CVE-2026-23001

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan.

Published Jan 25, 2026CWE-416EPSS 0.21%

Overview

CVE-2026-23001 is a high-severity vulnerability. It was published on January 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

macvlan: fix possible UAF in macvlan_forward_source()

Add RCU protection on (struct macvlan_source_entry)->vlan.

Whenever macvlan_hash_del_source() is called, we must clear

entry->vlan pointer before RCU grace period starts.

This allows macvlan_forward_source() to skip over

entries queued for freeing.

Note that macvlan_dev are already RCU protected, as they

are embedded in a standard netdev (netdev_priv(ndev)).

https: //lore.kernel.org/netdev/[email protected]/T/#u

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/15f6faf36e162532bec5cc05eb3fc622108bf2edRefgit.kernel.org/stable/c/232afc74a6dde0fe1830988e5827921f5ec9bb3fRefgit.kernel.org/stable/c/484919832e2db6ce1e8add92c469e5d459a516b5Refgit.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038eRefgit.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80eRefgit.kernel.org/stable/c/8133e85b8a3ec9f10d861e0002ec6037256e987eRefgit.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23001?

CVE-2026-23001 is a high-severity vulnerability. It was published on January 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23001?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23001?

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-2026-23001?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23001 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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