8.8

CVE-2026-53075: linux Incorrect Authorization

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2026-53075DEBIAN-CVE-2026-53075
Published 24-06-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-53075 is a high (CVSS 8.8) Incorrect Authorization vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 52 · Related 49
OPENSUSE-SU-2026:21388-1RHSA-2026:64775RHSA-2026:68531RHSA-2026:68532SUSE-SU-2026:22742-1SUSE-SU-2026:22769-1

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

-0.03 pp

From 0.25% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu166 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < c9edd90c57ae23692fff6b049fdfa4572a9fd532 | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 5080e188c914110034bbc569d5cfa2f06204681d | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 67e901e28d177ac9a9bed76d69ce3471e704a89e | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 954745d0223e7caec917c0b2d1a889ff56fa6e54 | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 3b2c2157dc2afc5c17cd7238afefca92f1ef330e | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 5013be175c7ffd8b39efbc3c9c4db5b10b85fea8 | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 1a8a51ce85075a56a743b6f142606dd2696a391c | ≥ 273ec51dd7ceaa76e038875d85061ec856d8905e, < 2bb6379416fd19f44c3423a00bfd8626259f6067 | 2.6.30
  • linux_kernel≥ 2.6.30, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.141 | ≥ 6.7, < 6.12.91 | ≥ 6.13, < 6.18.33 | ≥ 6.19, < 7.0.10
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.10-1

3 vendors · 169 products

References

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