Full Report
Red Hat security advisory (AV26-652)
Analysis Summary
# Vulnerability: Red Hat Linux Kernel Security Updates (AV26-652)
## CVE Details
- **CVE ID:** Multiple CVEs (The advisory refers to a collection of updates released between June 29 and July 5, 2026).
- **CVSS Score:** Varies by specific CVE; typically ranges from **Moderate to Important** for kernel updates.
- **CWE:** Commonly includes CWE-119 (Memory Corruption), CWE-416 (Use After Free), or CWE-20 (Improper Input Validation).
## Affected Systems
- **Products:**
- Red Hat CodeReady Linux Builder
- Red Hat Enterprise Linux (RHEL)
- Red Hat Enterprise Linux Server
- **Versions:** Multiple versions including:
- RHEL 7, 8, 9 (and associated dot releases)
- Architecture-specific versions for x86_64, s390x, ppc64le, and aarch64.
- **Configurations:** Systems running affected Linux kernel packages.
## Vulnerability Description
This advisory covers a batch of security fixes for the **Linux kernel**. While the specific flaw types vary per individual CVE within the batch, these updates generally address issues such as:
- Memory management flaws that could lead to local privilege escalation.
- Buffer overflows or race conditions in network drivers or filesystem components.
- Potential Denial of Service (DoS) triggers via malformed system calls.
## Exploitation
- **Status:** Not exploited in the wild (unless specified in individual CVE sub-reports); PoCs often emerge shortly after kernel source disclosures.
- **Complexity:** Generally Low to Medium.
- **Attack Vector:** Primarily Local (Local Privilege Escalation) or Network (if affecting the networking stack).
## Impact
- **Confidentiality:** Moderate to High (Potential data access via privilege escalation).
- **Integrity:** High (Potential for unauthorized system modifications).
- **Availability:** High (Potential for system crashes/kernel panics).
## Remediation
### Patches
Red Hat recommends updating the kernel to the latest version provided through the official Red Hat Subscription Management or yum/dnf repositories.
- **RHEL 9:** Update to the latest `kernel-9.x` packages.
- **RHEL 8:** Update to the latest `kernel-4.18.x` packages.
- **RHEL 7:** Update to the latest `kernel-3.10.x` packages.
*Note: A system reboot is required after applying kernel updates to activate the new version.*
### Workarounds
- No universal workaround exists for kernel vulnerabilities other than patching.
- Restrict unprivileged user access to compilers or debuggers to hinder exploit development.
- Utilize security modules like SELinux in `Enforcing` mode to limit the impact of successful exploits.
## Detection
- **Indicators of Compromise:** Unusual system crashes (Kernel panics), unexpected `sudo` usage, or unauthorized modifications to sensitive system files.
- **Detection methods and tools:**
- Use `yum check-update` or `dnf check-update` to identify missing security patches.
- Audit logs (via `auditd`) monitoring for suspicious system calls.
## References
- Red Hat Security Advisories: hxxps[://]access[.]redhat[.]com/security/security-updates/security-advisories
- Canadian Centre for Cyber Security (AV26-652): hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/red-hat-security-advisory-av26-652