CVE-2026-23405
Medium
Description
In the Linux kernel, the following vulnerability has been resolved: apparmor: fix: limit the number of levels of policy namespaces Currently the number of policy namespaces is not bounded relying on the user namespace limit. However policy namespaces aren't strictly tied to user namespaces and it is possible to create them and nest them arbitrarily deep which can be used to exhaust system resource. Hard cap policy namespaces to the same depth as user namespaces.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedApr 1, 2026
First seenApr 1, 2026
How to fix
Update
- linux linux_kernel5.10.253, 5.15.203, 6.1.169, 6.6.130, 6.12.77, 6.18.18, 6.19.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.36.1 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.169, 6.2 ≤ v < 6.6.130, 6.7 ≤ v < 6.12.77, 6.13 ≤ v < 6.18.18, 6.19 ≤ v < 6.19.8, 2.6.36, 7.0 | 5.10.253, 5.15.203, 6.1.169, 6.6.130, 6.12.77, 6.18.18, 6.19.8 |
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