Ubuntu USN-8662-1 Security Advisory: Linux Kernel Fixes for Multiple CVEs

Vulnerability Overview Vulnerability ID: USN-8662-1 Publication Date: 20 August 2026 Description: Multiple security issues were discovered in the Linux kernel, which attackers could exploit to compromise the system. This update fixes flaws in the following subsystems: - x86 architecture - Crypto API - InfiniBand drivers - Media drivers - STMicroelectronics network drivers - Network drivers - Ext4 filesystem - IPv4 networking - TCP network protocol - Locking primitives - Ceph core library - IPv6 networking - Multipath TCP - Netfilter - SCTP protocol - SMC sockets Affected Versions Affected Versions: - Ubuntu 16.04 LTS (xenial) - Ubuntu 14.04 LTS (trusty) Remediation Update Instructions: - After the standard system update, a system restart is required to apply all necessary changes. - Due to unavoidable ABI changes, kernel updates are assigned new version numbers, which requires recompiling and reinstalling all third-party kernel modules. This is automatically performed by the standard system upgrade unless the standard kernel meta-packages (such as , , , ) have been manually removed. Specific Update Versions: - Ubuntu 16.04 LTS (xenial): - linux-image-4.4.0-1158-kvm - 4.4.0-1158.169 - linux-image-4.4.0-1195-aws - 4.4.0-1195.210 - linux-image-4.4.0-284-generic - 4.4.0-284.318 - linux-image-4.4.0-284-lowlatency - 4.4.0-284.318 - linux-image-aws - 4.4.0.1195.199 - linux-image-generic - 4.4.0.284.290 - linux-image-generic-lts-xenial - 4.4.0.284.290 - linux-image-kvm - 4.4.0.1158.155 - linux-image-lowlatency - 4.4.0.284.290 - linux-image-lowlatency-lts-xenial - 4.4.0.284.290 - linux-image-virtual - 4.4.0.284.290 - linux-image-virtual-lts-xenial - 4.4.0.284.290 - Ubuntu 14.04 LTS (trusty): - linux-image-4.4.0-1157-kvm - 4.4.0-1157.163 - linux-image-4.4.0-284-generic - 4.4.0.284.318-14.04.1 - linux-image-4.4.0-284-lowlatency - 4.4.0.284.318-14.04.1 - linux-image-aws - 4.4.0.1157.154 - linux-image-generic-lts-xenial - 4.4.0.284.318-14.04.1 - linux-image-lowlatency-lts-xenial - 4.4.0.284.318-14.04.1 - linux-image-virtual-lts-xenial - 4.4.0.284.318-14.04.1 References CVE-2026-53359 CVE-2026-53228 CVE-2026-53225 CVE-2026-53176 CVE-2026-53006 CVE-2026-52986 CVE-2026-52982 CVE-2026-52955 CVE-2026-46266 CVE-2026-43499 Related Notices USN-8661-1 USN-8660-1 USN-8656-1 USN-8645-1 USN-8637-1 USN-8636-1 USN-8636-2 USN-8635-1 USN-8634-1 USN-8633-1 Reduce Security Risk Ubuntu Pro provides ten years of security coverage for over 25,000 packages in the Main and Universe repositories and can be used free of charge for up to five machines. Additional Information Links to contact the team, community, careers, blog, resources, news center, etc., are provided at the bottom of the page. The page footer also contains links regarding Ubuntu and Canonical trademarks, legal information, data privacy, manage tracker settings, report site errors, etc.

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Ubuntu USN-8662-1 Security Advisory: Linux Kernel Fixes for Multiple CVEs

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