Ubuntu patches 340+ Linux kernel flaws
Ubuntu released security updates addressing over 340 vulnerabilities in the Linux kernel across multiple supported versions, including flaws enabling code execution and privilege escalation.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 21 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- A public exploit is recorded for CVE-2023-2640 (weaponized) and CVE-2023-32629 (weaponized); no exploitation in the wild is recorded.
France's CERT (ANSSI) has published an advisory regarding multiple security vulnerabilities discovered in the Ubuntu Linux kernel. The vulnerabilities affect Ubuntu 16.04 ESM, Ubuntu 20.04 ESM, and Ubuntu 22.04 LTS. Ubuntu released six security bulletins (USN-8426-2, USN-8439-1, USN-8440-1, USN-8361-3, USN-8390-2, and USN-8441-1) between June 16-17, 2026, addressing these issues.
The vulnerabilities encompass a wide range of potential impacts including arbitrary code execution, privilege escalation, confidentiality breaches, denial of service, security policy bypass, and data integrity violations. The advisory references over 340 CVE identifiers spanning from 2023 through 2026, indicating a comprehensive kernel security update addressing both newly discovered and previously disclosed vulnerabilities.
Organizations running affected Ubuntu versions should consult the referenced Ubuntu security notices and apply the available patches. The sheer volume of addressed CVEs suggests this is a significant cumulative security update consolidating fixes for numerous kernel subsystems and components.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0787/
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