PT-2026-39052 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43391

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the nsfs component where permission checks for handle opening are insufficiently strict. This allows privileged services to potentially see namespaces belonging to other privileged services, which could lead to information leakage. The resolution involves implementing the may see all namespaces() helper function to centralize the policy regarding namespace visibility.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43391

Affected Products

Linux Kernel

References · 12

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43391 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43391 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43391 · Vendor Advisory
• https://git.kernel.org/stable/c/1797ee11451f1b2be69863a9f5bd43b948813fdf · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43391 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43391 · Security Note
• https://git.kernel.org/stable/c/d2324a9317f00013facb0ba00b00440e19d2af5e · Patch
• https://ubuntu.com/security/CVE-2026-43391 · Vendor Advisory
• https://git.kernel.org/linus/d2324a9317f00013facb0ba00b00440e19d2af5e · Note
• https://twitter.com/infoflowcloud/status/2052769630725275873 · Twitter Post
• https://twitter.com/CVEnew/status/2052767692386640311 · Twitter Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post