CVE-2026-43391

HighCVSS 8.8/10Last modified Nov 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

nsfs: tighten permission checks for handle opening

Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected software

VendorProductVersions
LinuxLinux>= 5222470b2fbb3740f931f189db33dd1367b1ae75, < 24ebaf6676ae4f74f4856eb645959b15e62bc1b4; >= 5222470b2fbb3740f931f189db33dd1367b1ae75, < 1797ee11451f1b2be69863a9f5bd43b948813fdf; >= 5222470b2fbb3740f931f189db33dd1367b1ae75, < d2324a9317f00013facb0ba00b00440e19d2af5e
LinuxLinux6.18

References

Timeline

Published
May 8, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-43391: High severity, CVSS 8.8 | Vulnix