Full Report
Ubuntu security advisory (AV26-133)
Analysis Summary
# Vulnerability: Multiple Flaws in Ubuntu Linux Kernel (AV26-133)
## CVE Details
- **CVE ID:** Multiple (Refer to specific Ubuntu Security Notices for exhaustive list)
- **CVSS Score:** Varies (Typically ranging from Medium to High for Kernel advisories)
- **CWE:** Commonly includes CWE-416 (Use After Free), CWE-190 (Integer Overflow), and CWE-125 (Out-of-bounds Read).
## Affected Systems
- **Products:** Ubuntu Linux
- **Versions:**
- Ubuntu 16.04 LTS (ESM)
- Ubuntu 18.04 LTS (ESM)
- Ubuntu 20.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 25.10
- **Configurations:** Systems running affected Linux kernel versions across various architectures (x86_64, ARM, etc.).
## Vulnerability Description
This advisory (AV26-133) aggregates multiple security notices published by Ubuntu between February 9 and 15, 2026. These updates address various vulnerabilities within the Linux kernel. Historically, such flaws in the Ubuntu kernel involve memory management errors, race conditions in network drivers, or improper validation in filesystem components, which could allow for unintended system behavior.
## Exploitation
- **Status:** Varies by specific CVE; typically listed as "Not exploited in the wild" at the time of release unless otherwise noted in specific USNs.
- **Complexity:** Low to Medium.
- **Attack Vector:** Typically Local (Privilege Escalation) or Network (DoS), depending on the specific kernel subsystem affected.
## Impact
- **Confidentiality:** Moderate to High (Potential for unauthorized memory access).
- **Integrity:** High (Potential for unauthorized modification of system files or memory).
- **Availability:** High (Potential for system crashes or Kernel panics/Denial of Service).
## Remediation
### Patches
Users are advised to update their systems to the latest kernel versions provided by Ubuntu:
- **Ubuntu 24.04 LTS:** Update to the latest `linux-image-6.8` or newer.
- **Ubuntu 22.04 LTS:** Update to the latest `linux-image-5.15` or newer.
- **Ubuntu 20.04 LTS:** Update to the latest `linux-image-5.4` or newer.
- *Note: Specific version strings depend on the hardware enablement (HWE) stack in use.*
### Workarounds
No general workarounds are provided for kernel-level vulnerabilities; applying the official security updates and rebooting the system is the only definitive mitigation.
## Detection
- **Indicators of Compromise:** Unusual kernel panics in system logs (`dmesg`), unexpected elevation of privileges for non-root users, or unauthorized process execution.
- **Detection methods and tools:**
- Use `uname -r` to check the current running kernel version.
- Run `apt list --upgradable` to identify pending security patches.
## References
- Ubuntu Security Notices: hxxps[://]ubuntu[.]com/security/notices
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/ubuntu-security-advisory-av26-133