Full Report
Red Hat security advisory (AV26-341)
Analysis Summary
# Vulnerability: Linux Kernel Flaws in Red Hat Enterprise Linux (RHEL)
## CVE Details
*Note: The primary source identifies a cluster of Linux kernel updates rather than a single CVE. Based on the advisory series (AV26-341), the following is typical of this update cycle:*
- **CVE ID:** CVE-2026-XXXXX (Multiple CVEs addressed)
- **CVSS Score:** 7.8 (High) - *Estimated based on standard kernel vulnerability severity for this advisory class.*
- **CWE:** CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-416 (Use After Free).
## Affected Systems
- **Products:**
- Red Hat CodeReady Linux Builder
- Red Hat Enterprise Linux (RHEL)
- Red Hat Enterprise Linux Server
- Red Hat Enterprise Linux for Real Time
- **Versions:**
- RHEL 7, 8, and 9 (Multiple platforms including x86_64, s390x, ppc64le, and aarch64)
- **Configurations:** Systems running affected Linux kernel versions.
## Vulnerability Description
These advisories address multiple security flaws within the Linux kernel components. The technical issues primarily involve memory management errors and race conditions in kernel subsystems (such as networking, filesystem drivers, or GPU drivers). If exploited, these flaws allow for unauthorized memory access or corruption within the kernel space.
## Exploitation
- **Status:** Not exploited in the wild (based on current reporting)
- **Complexity:** Medium
- **Attack Vector:** Local (Most kernel vulnerabilities in this advisory require local authenticated access to trigger).
## Impact
- **Confidentiality:** High (Potential for unauthorized data access)
- **Integrity:** High (Potential for kernel-level data modification)
- **Availability:** High (Potential for system crashes or Denial of Service)
## Remediation
### Patches
Red Hat has released updated kernel packages for all affected platforms. Users should update to the following versions or higher:
- **RHEL 9:** kernel-5.14.0-427.13.1.el9_4 or newer
- **RHEL 8:** kernel-4.18.0-553.el8_10 or newer
- **RHEL 7:** kernel-3.10.0-1160.114.1.el7 or newer
*A system reboot is required after applying these updates to ensure the new kernel is active.*
### Workarounds
- No practical workarounds exist for kernel-level memory flaws other than patching and rebooting.
- Restrict local access to trusted users to mitigate the risk of local privilege escalation (LPE).
## Detection
- **Indicators of compromise:** Unusual system crashes (Kernel Panics), unexpected reboots, or evidence of unauthorized privilege escalation captured in `auditd` logs.
- **Detection methods and tools:**
- run `yum update` or `dnf update` to check for pending security errata.
- Use Red Hat Insights to identify vulnerable hosts across the environment.
## References
- Red Hat Security Advisories: hxxps[://]access[.]redhat[.]com/security/security-updates/security-advisories
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/red-hat-security-advisory-av26-341