ppp: require CAP_NET_ADMIN in target netns for unattached ioctls

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Summary

CVECVE-2026-53075
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:21 UTC
Updated2026-06-28 08:16:32 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002570000 probability, percentile 0.170270000 (date 2026-06-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e c9edd90c57ae23692fff6b049fdfa4572a9fd532 git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 5080e188c914110034bbc569d5cfa2f06204681d git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 67e901e28d177ac9a9bed76d69ce3471e704a89e git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 954745d0223e7caec917c0b2d1a889ff56fa6e54 git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 3b2c2157dc2afc5c17cd7238afefca92f1ef330e git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 1a8a51ce85075a56a743b6f142606dd2696a391c git Not specified
CNA Linux Linux affected 273ec51dd7ceaa76e038875d85061ec856d8905e 2bb6379416fd19f44c3423a00bfd8626259f6067 git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c9edd90c57ae23692fff6b049fdfa4572a9fd532 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2bb6379416fd19f44c3423a00bfd8626259f6067 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5080e188c914110034bbc569d5cfa2f06204681d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a8a51ce85075a56a743b6f142606dd2696a391c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/954745d0223e7caec917c0b2d1a889ff56fa6e54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67e901e28d177ac9a9bed76d69ce3471e704a89e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b2c2157dc2afc5c17cd7238afefca92f1ef330e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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