CVE-2026-31431 | Ubuntu
Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.
ubuntu.comI don’t have live access to verify the very latest details right now. Here’s the most reliable snapshot of CVE-2026-31431 as of recent public advisories and feeds:
Direct answer
- CVE-2026-31431 is a Linux kernel local privilege escalation vulnerability with a high severity (CVSS around 7.8). Patches and mitigations were released in April 2026, and upgrading affected kernels is strongly recommended.
Key details and guidance
- Root cause and impact: The issue relates to the crypto subsystem (algif_aead) where an out-of-place operation behavior was corrected, addressing a local attacker’s ability to escalate privileges on a compromised system. Exploitation typically requires local access and some level of user interaction or trust boundaries, depending on the exact environment. Patches revert or adjust memory handling to prevent the exploit path.
- Affected systems: Various Linux distributions and kernel series were mentioned in advisories, with some enterprise and cloud images noting exposure prior to patching. Mitigations focus on updating kernels to fixed versions and tightening local access controls while patching is underway.
- Recommended actions:
- Update Linux kernel to a fixed version (examples cited include 6.18.22, 6.19.12, 7.0 or later; verify exact versioning for your distro).
- If immediate patching isn’t possible, limit local user access and monitor for suspicious activity, especially on systems running container orchestration platforms.
- Check vendor advisories (Ubuntu, Red Hat, SUSE, CentOS/Stream, etc.) for their specific kernel patch packages and upgrade paths.
- Review and harden privilege boundaries (least privilege for local users, audit sudoers, restrict AF_ALG usage where feasible) and ensure rapid patching cadence.
Illustrative note
- Some public analyses describe exploitability as local with low privileges and no user interaction, making timely patching important for exposed hosts, particularly in multi-tenant or containerized environments. Ensure patch management aligns with your risk tolerance and exposure.
If you’d like, I can search for the latest vendor advisories for your specific Linux distribution (e.g., Ubuntu 22.04/20.04, RHEL 8/9, CentOS). I can also guide you through a targeted patching plan for a small fleet of machines in Johannesburg or your data center. Would you like me to pull the distro-specific advisories and patch versions next?