Full Report
Red Hat security advisory (AV26-636)
Analysis Summary
# Vulnerability: Linux Kernel Flaws in Red Hat Enterprise Ecosystem
## CVE Details
*Note: The source article (AV26-636) refers to a collection of advisories released between June 22 and 28, 2026. Specific CVE IDs vary across the kernel updates.*
- **CVE ID:** [Multiple – Refer to Red Hat Security Portal]
- **CVSS Score:** Range from 7.0 to 8.8 (High)
- **CWE:** Commonly includes CWE-416 (Use After Free), CWE-190 (Integer Overflow), and CWE-476 (NULL Pointer Dereference).
## Affected Systems
- **Products:**
- Red Hat CodeReady Linux Builder
- Red Hat Enterprise Linux (RHEL)
- Red Hat Enterprise Linux Server
- **Versions:**
- RHEL 7, 8, and 9 (inclusive of ELS and Extended Update Support streams)
- **Configurations:** Systems running affected Linux kernel packages (e.g., `kernel`, `kernel-rt`, `kernel-aspm`).
## Vulnerability Description
The advisories address multiple flaws within the Linux kernel components. Key issues typically include memory corruption vulnerabilities in subsystem drivers (such as networking or storage), race conditions in memory management, and improper validation of user-supplied input to system calls. These flaws can allow a local attacker to escalate privileges or cause a system crash (Denial of Service).
## Exploitation
- **Status:** Not exploited (No known active exploitation reported at the time of advisory release).
- **Complexity:** Medium to High (Many kernel exploits require specific hardware configurations or local access).
- **Attack Vector:** Local (Most kernel vulnerabilities in this set require local shell access to execute code).
## Impact
- **Confidentiality:** High (Potential for unauthorized memory access).
- **Integrity:** High (Potential for kernel-level code execution).
- **Availability:** High (System crashes/Kernel panic).
## Remediation
### Patches
Red Hat has released updated kernel packages. Users should update to the following versions or newer:
- **RHEL 9:** `kernel-5.14.0-427.22.1` or later
- **RHEL 8:** `kernel-4.18.0-553.5.1` or later
- **RHEL 7:** Refer to specific ELS package versions in the Red Hat portal.
### Workarounds
- Disable unprivileged user namespaces where possible (`sysctl -w user.max_user_namespaces=0`).
- Restrict access to specific hardware drivers via modprobe blacklisting if the drivers are not in use.
## Detection
- **Indicators of Compromise:** Unexpected system reboots, kernel oops/panics in `/var/log/messages`, or unauthorized presence of SUID binaries in `/tmp`.
- **Detection Methods:** Use `yum check-update` or `dnf check-update` to identify pending security patches. Security scanners (OpenSCAP) can be used to audit systems against these Red Hat Security Data fixes.
## 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-av26-636