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Vulnerability record · CVE-2026-53075 · published 24 June 2026

CVE-2026-53075: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.18% · top 93.6%
8.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
21 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c Patch
https://git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067 Patch
https://git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e Patch
https://git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 Patch
https://git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d Patch
https://git.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89e Patch
https://git.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54 Patch
https://git.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53075), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.