Full Report
Red Hat security advisory (AV26-442)
Analysis Summary
# Vulnerability: Red Hat Linux Kernel Multiple Vulnerabilities (May 2026 Rollup)
## CVE Details
- **CVE ID:** CVE-2026-XXXX (Refer to specific Red Hat Errata via the link below)
- **CVSS Score:** Range from 6.0 to 9.0+ (Estimated high severity based on Kernel context)
- **CWE:** Often includes CWE-416 (Use After Free), CWE-190 (Integer Overflow), or CWE-119 (Memory Corruption).
## 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:** Multiple versions (specifically RHEL 7, 8, and 9 variants).
- **Configurations:** Systems running affected Linux Kernel versions across multiple hardware platforms (x86_64, s390x, ppc64le, aarch64).
## Vulnerability Description
This advisory covers a collection of security updates for the Linux Kernel. In the context of Red Hat Enterprise Linux, these vulnerabilities typically involve flaws in kernel subsystems (such as networking, filesystem drivers, or memory management) that could allow a local or remote attacker to bypass security restrictions or cause a denial-of-service (DoS) condition.
## Exploitation
- **Status:** Not currently reported as exploited in the wild (unless identified otherwise in specific sub-errata).
- **Complexity:** Medium (Most kernel exploits require specific system states or local access).
- **Attack Vector:** Primarily Local (Privilege Escalation), though some Network vectors may exist for specific driver flaws.
## Impact
- **Confidentiality:** High (Potential for unauthorized memory access)
- **Integrity:** High (System-level modification capabilities)
- **Availability:** High (Potential for Kernel Panics / System Crashes)
## Remediation
### Patches
Red Hat has released several errata to address these issues. Users should update to the following or later versions:
- **RHEL updates:** Apply patches via `yum update` or `dnf update` for the `kernel` and `kernel-rt` packages.
- **Specific Errata:** Consult the Red Hat Customer Portal for the specific Errata IDs associated with the May 4–10 window.
### Workarounds
- **Note:** Because these are kernel-level vulnerabilities, there are rarely effective functional workarounds other than disabling specific vulnerable modules (if applicable) or restricting user access.
## Detection
- **Indicators of Compromise:** Unusual system crashes (OOPS/Panic logs), unauthorized privilege escalation attempts in audit logs, or unexpected network traffic if a network-facing driver is vulnerable.
- **Detection methods:** Red Hat Insights can be used to identify vulnerable hosts across an enterprise environment. Use `rpm -q kernel` to verify if the running version matches the patched versions listed in the advisory.
## 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-av26-442