Full Report
Red Hat security advisory (AV26-621)
Analysis Summary
# Vulnerability: Red Hat Linux Kernel Multiple Flaws (June 2026)
## CVE Details
*Note: This advisory (AV26-621) refers to a collection of kernel updates. Specific CVE identifiers are often numerous in kernel rollups.*
- **CVE ID:** Multiple (Refer to individual Red Hat advisories for specific IDs)
- **CVSS Score:** Range typically 7.0 - 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 Enterprise Linux (RHEL)
- Red Hat CodeReady Linux Builder
- Red Hat Enterprise Linux Server
- Red Hat Enterprise Linux for Real Time
- **Versions:** Multiple versions and platforms including RHEL 7, 8, and 9 (Platform-specific).
- **Configurations:** Systems running the Linux kernel across x86_64, s390x, ppc64le, and aarch64 architectures.
## Vulnerability Description
This advisory covers a series of security updates for the Linux kernel. These flaws typically involve memory management issues, race conditions, or improper validation of input in kernel-space drivers and subsystems. If triggered, these vulnerabilities allow for the execution of arbitrary code in kernel context or a denial-of-service (system crash).
## Exploitation
- **Status:** Vulnerabilities addressed; individual exploitation status varies by CVE (check vendor portal for specific PoC status).
- **Complexity:** Medium to Low (depending on specific subsystem).
- **Attack Vector:** Primarily Local (Privilege Escalation), though some Network vectors may exist for specific protocol stacks.
## Impact
- **Confidentiality:** High (Potential access to kernel memory)
- **Integrity:** High (Potential for unauthorized modification of system files)
- **Availability:** High (Potential for system-wide Denial of Service/Kernel Panic)
## Remediation
### Patches
Red Hat recommends updating the `kernel` package to the latest version available via the Red Hat Subscription Management (RHSM) or Yum/DNF repositories.
- **RHEL 9:** Update to the latest available kernel version.
- **RHEL 8:** Update to the latest available kernel version.
- **RHEL 7:** For customers with Extended Lifecycle Support (ELS).
### Workarounds
- No universal workaround exists for kernel-level flaws other than restricting local access to untrusted users and disabling unnecessary kernel modules via `modprobe` blacklist.
## Detection
- **Indicators of compromise:** Unexpected system reboots, kernel panics (check `/var/log/messages` or `dmesg`), or unauthorized elevation of privileges for regular user accounts.
- **Detection methods and tools:** Use `rpm -q kernel` to verify if the currently running version is older than the patched versions cited in the Red Hat Customer Portal.
## References
- **Vendor advisories:** hxxps[://]access[.]redhat[.]com/security/security-updates/security-advisories
- **Canadian Centre for Cyber Security:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/red-hat-security-advisory-av26-621