VDB
CVE-2026-23405
CVE-2026-23405
PUBLISHED
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.
EPSS 0.01% · 1.0th percentile
Risk Scores
EPSS Score
0.01%
1.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| linux | linux_kernel | 2.6.36, 2.6.36, 2.6.36 |
| Linux | Linux | c88d4c7b049e87998ac0a9f455aa545cc895ef92, c88d4c7b049e87998ac0a9f455aa545cc895ef92, c88d4c7b049e87998ac0a9f455aa545cc895ef92 |
Exploit Intelligence
- CIRCL seen: CVE-2026-23405 (circl-sighting)
- https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e (circl)
- https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 (circl)
- https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d (circl)
- https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 (circl)
- https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 (circl)
- 4593.2.0.yml (github-poc)
- 4593.2.0.yml (github-poc)
- 4593.2.0.yml (github-poc)
- 4593.2.0.yml (github-poc)
…and 4 more exploits
Timeline
- Apr 1, 2026 CVE Published
- Apr 1, 2026 PoC Published
- Apr 1, 2026 Security Advisory
- Apr 24, 2026 CVE Updated
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
- Apr 29, 2026 Distribution Patch
References
- https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e url
- https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603 url
- https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d url
- https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616 url
- https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2 url
- https://nvd.nist.gov/vuln/detail/CVE-2026-23405 advisory
- https://ubuntu.com/security/notices/USN-8180-5 advisory
- https://ubuntu.com/security/notices/USN-8183-2 advisory
- https://ubuntu.com/security/notices/USN-8098-10 advisory
- https://ubuntu.com/security/notices/USN-8201-1 advisory
- https://ubuntu.com/security/notices/USN-8179-3 advisory
- https://ubuntu.com/security/notices/USN-8203-1 advisory
- https://ubuntu.com/security/notices/USN-8180-4 advisory
- https://ubuntu.com/security/notices/USN-8200-1 advisory
- https://ubuntu.com/security/notices/USN-8204-1 advisory
- https://ubuntu.com/security/notices/USN-8200-2 advisory
- https://ubuntu.com/security/notices/USN-8180-3 advisory
- https://www.suse.com/support/update/announcement/2026/suse-su-202621930-1 advisory
- https://www.suse.com/support/update/announcement/2026/suse-su-202621841-1 advisory
- https://www.suse.com/support/update/announcement/2026/suse-su-20262238-1 advisory
…and 84 more