Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.36.1, < 5.10.253 |
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
FAQ
What is CVE-2026-23405?
CVE-2026-23405 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2026-23405?
CVE-2026-23405 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23405?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.