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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-53075 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c kernel.org
https://git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067 kernel.org
https://git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e kernel.org
https://git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 kernel.org
https://git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d kernel.org
https://git.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89e kernel.org
https://git.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54 kernel.org
https://git.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-53075
NVD Published Date:
06/24/2026
NVD Last Modified:
06/28/2026
Source:
kernel.org