PT-2026-29488 · Linux · Linux

Published 2026-04-01 · Updated 2026-04-01 · CVE-2026-23405

NVD

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.

Related Identifiers

CVE-2026-23405

Affected Products

Linux

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-23405 · Security Note
• https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d · Note
• https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 · Note
• https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 · Note
• https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 · Note
• https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e · Note