Linux kernel vulnerabilities enable privilege escalation in RHEL
Red Hat patches multiple Linux kernel vulnerabilities enabling privilege escalation, data confidentiality breaches, and denial of service across RHEL 8 and 9.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 24 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The French CERT (CERT-FR) has issued an advisory regarding multiple vulnerabilities discovered in the Red Hat Enterprise Linux kernel affecting versions 8 and 9 across various architectures including x86_64, ARM64, IBM z Systems, and Power architectures. The vulnerabilities span various update channels including Extended Update Support, Extended Life Cycle, and standard release channels.
The vulnerabilities allow attackers to achieve privilege escalation, compromise data confidentiality and integrity, bypass security policies, and cause denial of service conditions. Red Hat has released patches via three separate security bulletins (RHSA-2026:21209, RHSA-2026:21706, and RHSA-2026:21745) issued on May 27-28, 2026. The advisory references 24 distinct CVE identifiers spanning from 2025 through 2026.
Organizations running Red Hat Enterprise Linux 8 or 9 on any supported architecture should prioritize patching, particularly for systems exposed to untrusted users or network traffic. The variety of impacts suggests multiple attack vectors within the kernel subsystems.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0665
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