CVE-2026-23405
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.
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2Patch
- https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2ePatch
- https://git.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225dPatch
- https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616Patch
- https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603Patch
- https://git.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3Patch
- https://git.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72Patch
- https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.