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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
Self-Check
OpenVAS

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

Сообщество свободного программного обеспечения
oss-projectaka fsf
Debian GNU/LinuxOn-premOS
Operating Systems / linux-distro
LinuxOn-premOS
Operating Systems / linux-distro
Amazon.com Inc.
commercial·USaka amazon, amazon web services
Amazon LinuxMixed
Operating Systems / linux-distro
Red Hat Inc.
commercial·USaka red hat
Red Hat Enterprise LinuxOn-premOS
Operating Systems / linux-distro
Canonical Ltd.
commercial·GBaka canonical
UbuntuOn-premOS
Operating Systems / linux-distro
ООО «КНС ГРУПП»
commercial·RUaka кнс групп
Татлин-ОбджектOn-prem
Enterprise Software / document-mgmt
Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-43403?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://feedly.com/cve/CVE-2026-43403
feedly.com
https://lore.kernel.org/linux-cve-announce/2026050840-CVE-2026-43403-3869@gregkh/
lore.kernel.org
https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38
git.kernel.org
and 10 more references View all →

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