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CVE-2026-53075

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls /dev/ppp open is currently authorized against file->f_cred->us…

Published Jun 24, 2026EPSS 0.25%

Overview

CVE-2026-53075 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

/dev/ppp open is currently authorized against file->f_cred->user_ns,

while unattached administrative ioctls operate on current->nsproxy->net_ns.

As a result, a local unprivileged user can create a new user namespace

with CLONE_NEWUSER, gain CAP_NET_ADMIN only in that new user namespace,

and still issue PPPIOCNEWUNIT, PPPIOCATTACH, or PPPIOCATTCHAN against

an inherited network namespace.

Require CAP_NET_ADMIN in the user namespace that owns the target network

namespace before handling unattached PPP administrative ioctls.

This preserves normal pppd operation in the network namespace it is

actually privileged in, while rejecting the userns-only inherited-netns

case.

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/1a8a51ce85075a56a743b6f142606dd2696a391cRefgit.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067Refgit.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330eRefgit.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8Refgit.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681dRefgit.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89eRefgit.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54Refgit.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53075?

CVE-2026-53075 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-53075?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-53075?

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-2026-53075?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53075 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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