Ubuntu 16.04 Kernel Critical Privilege Escalation Vuln USN-8441-1
ubuntu
June 17, 2026
Several security issues were fixed in the Linux kernel.
Summary
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel - linux-oracle: Linux kernel for Oracle Cloud systems Details: It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - Packet sockets; (CVE-2026-31504,...
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Topics Covered
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS linux-image-4.15.0-1154-oracle 4.15.0-1154.165~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1185-gcp 4.15.0-1185.202~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1192-aws 4.15.0-1192.205~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1201-azure 4.15.0-1201.216~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-250-generic 4.15.0-250.262~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-250-lowlatency 4.15.0-250.262~16.04.1 Available with Ubuntu Pro linux-image-aws-hwe 4.15.0.1192.205~16.04.1 Available with Ubuntu Pro linux-image-azure 4.15.0.1201.216~16.04.1 Available with Ubuntu Pro linux-image-gcp 4.15.0.1185.202~16.04.1 Available with Ubuntu Pro linux-image-generic-hwe-16.04 4.15.0.250.262~16.04.1 Available with Ubuntu Pro linux-image-gke 4.15.0.1185.202~16.04.1 Available with Ubuntu Pro linux-image-lowlatency-hwe-16.04 4.15.0.250.262~16.04.1 Available with Ubuntu Pro linux-image-oem 4.15.0.250.262~16.04.1 Available with Ubuntu Pro linux-image-oracle 4.15.0.1154.165~16.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-16.04 4.15.0.250.262~16.04.1 Available with Ubuntu Pro After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.
References
https://ubuntu.com/security/notices/USN-8441-1
CVE-2026-31431, CVE-2026-31504, CVE-2026-43033, CVE-2026-43077,
CVE-2026-43078, CVE-2026-46028
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Ubuntu Security Notice USN-8441-1
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