nstree: tighten permission checks for listing

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Summary

CVECVE-2026-43390
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:50 UTC
Updated2026-05-26 15:00:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nstree: tighten permission checks for listing 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000140000 probability, percentile 0.030250000 (date 2026-05-28)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 7.0 rc1 All All
Operating System Linux Linux Kernel 7.0 rc2 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 76b6f5dfb3fda76fce1f9990d6fa58adc711122b 0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 git Not specified
CNA Linux Linux affected 76b6f5dfb3fda76fce1f9990d6fa58adc711122b 8d76afe84fa2babf604b3c173730d4d2b067e361 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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