Full Report
Red Hat security advisory (AV26-557)
Analysis Summary
# Vulnerability: Red Hat Linux Kernel Security Updates (June 2026)
## CVE Details
*Note: The source advisory summarizes a collection of updates. Specific CVE IDs vary across the impacted RHEL versions. Users should consult the Red Hat portal for the specific mapping of the following types of flaws addressed in this window:*
- **CVE ID:** [Multiple – See Red Hat 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-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:**
- RHEL 7, 8, and 9 (multiple platforms including x86_64, s390x, ppc64le, and aarch64)
- **Configurations:** Systems running affected Linux kernel versions.
## Vulnerability Description
This advisory covers a batch of security updates for the **Linux kernel**. The addressed flaws typically involve memory management issues or logic errors within kernel subsystems (such as networking, filesystem drivers, or GPU drivers). These vulnerabilities could allow a local or remote attacker to bypass security restrictions, escalate privileges, or cause a system crash.
## Exploitation
- **Status:** Not exploited in the wild (based on current reporting); PoCs may exist for specific kernel sub-components.
- **Complexity:** Medium to High (Depending on the specific CVE)
- **Attack Vector:** Primarily Local (Privilege Escalation), though some Network vectors may exist for specific drivers.
## Impact
- **Confidentiality:** High (Potential for unauthorized memory access)
- **Integrity:** High (System-level modification potential)
- **Availability:** High (Kernel panic/Denial of Service)
## Remediation
### Patches
Red Hat has released updated kernel packages for all affected versions. Users should update via `yum` or `dnf`:
- `kernel-latest` (or specific version keyed to the RHEL release)
- `kernel-rt` (for Real Time versions)
**Action:** Execute `sudo dnf update kernel` and **reboot the system** to apply the changes.
### Workarounds
- No universal workaround exists for kernel-level flaws.
- Restrict non-privileged user access to the system.
- Disable unused kernel modules and minimize the attack surface.
## Detection
- **Indicators of compromise:** Unusual system crashes (Kernel Panics), unexpected privilege changes for local users, or unauthorized access to sensitive files.
- **Detection methods and tools:**
- Use `auditd` to monitor for suspicious syscalls.
- Verify kernel version using `uname -r` to ensure it matches the patched version released after June 1, 2026.
## 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-av26-557