nstree: tighten permission checks for listing
Published May 8, 2026
5.5
MEDIUMCVSS 3.1
EPSS 0.14%
Description
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.
Affected products
-
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
-
- Version 6.19StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<6.19
- Version 6.19.9StatusunaffectedConstraints<=6.19.*
- Version 7.0StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
- ≥ 6.19 · < 6.19.9
- 7.0
- 7.0
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.14% (0.00143) | 3.04th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.11% (0.00107) | 1.41th | v5 (v2026.06.15) |
| May 9, 2026 | 0.02% (0.00018) | 5.07th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2026-43390 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2468196 Issue Tracking
- https://git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 Patch
- https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361 Patch
- https://lore.kernel.org/linux-cve-announce/2026050836-CVE-2026-43390-9540@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-43390
- https://www.cve.org/CVERecord?id=CVE-2026-43390
Change history (0)
No recorded changes yet.