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CVE-2026-43403

nsfs: tighten permission checks for ns iteration ioctls

Published: May 8, 2026Updated: May 21, 2026 Sources: CVE List NVD BDUNVD-CWE-noinfo
8.8HIGH
NVD MITRE
EPSS Score
0.1%
Top 97.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

In the Linux kernel, the following vulnerability has been resolved: nsfs: tighten permission checks for ns iteration ioctls 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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfo

Affected Products

linux kernellinux
On-premOS
Operating Systems
LinuxLinux
On-premOS
Operating Systems / linux-distro
Amazon LinuxAmazon.com Inc.
Mixed
Operating Systems / linux-distro
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
linuxoss-projectOperating Systemsaka the linux kernel
amazon.com inc.commercialUSOperating Systemsaka amazon, amazon web services
red hat inc.commercialUSOperating Systemsaka red hat
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 3 more affected products View all →

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

References

https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9
git.kernel.org
https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4
git.kernel.org
https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38
git.kernel.org
and 10 more references View all →

Timeline

Published
May 8, 2026
Last Updated
May 21, 2026

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