CVE-2026-23405

MEDIUM EPSS 7.8%
Published Apr 1, 20263mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 1, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
7.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥2.6.36.1  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.169
linuxlinux_kernel*≥6.2  –  <6.6.130
linuxlinux_kernel*≥6.7  –  <6.12.77
linuxlinux_kernel*≥6.13  –  <6.18.18
linuxlinux_kernel*≥6.19  –  <6.19.8
linuxlinux_kernel2.6.36any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/306039414932c80f8420695a24d4fe10c84ccfb2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d
    Patch