Linux kernel vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 ESM - Ubuntu 22.04 LTS - Ubuntu 14.04 ESM Summary Several security issues were fixed in the kernel. Software Description - linux - Linux kernel - linux-aws - Linux kernel for Amazon Web Services (AWS) systems - linux-azure - Linux kernel for Microsoft Azure Cloud systems - linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems - linux-gke - Linux kernel for Google Container Engine (GKE) systems - linux-gkeop - Linux kernel for Google Container Engine (GKE) systems - linux-ibm - Linux kernel for IBM cloud systems Details It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux kernel did not properly perform data buffer size validation in some situations. A physically proximate attacker could use this to craft a malicious USB device that when inserted, could cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2023-1380) Reima Ishii discovered that the nested KVM implementation for Intel x86 processors in the Linux kernel did not properly validate control registers in certain situations. An attacker in a guest VM could use this to cause a denial of service (guest crash). (CVE-2023-30456) Mingi Cho discovered that the netfilter subsystem in the Linux kernel did not properly validate the status of a nft chain while performing a lookup by id, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-31248) Gwangun Jung discovered that the Quick Fair Queueing scheduler implementation in the Linux kernel contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-31436) Tanguy Dubroca discovered that the netfilter subsystem in the Linux kernel did not properly handle certain pointer data type, leading to an out-of- bounds write vulnerability. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-35001) Update instructions The problem can be corrected by updating your kernel livepatch to the following versions: Ubuntu 20.04 LTS aws - 96.2 azure - 96.2 gcp - 96.2 gcp - 96.3 generic - 96.2 generic - 96.3 gke - 96.2 gke - 96.3 gkeop - 96.2 ibm - 96.2 lowlatency - 96.2 lowlatency - 96.3 Ubuntu 18.04 LTS azure - 96.2 gcp - 96.2 generic - 96.2 gke - 96.2 gkeop - 96.2 ibm - 96.2 lowlatency - 96.2 Ubuntu 16.04 ESM aws - 96.2 azure - 96.2 gcp - 96.2 generic - 96.2 lowlatency - 96.2 Ubuntu 22.04 LTS azure - 96.2 azure - 96.3 gcp - 96.2 gcp - 96.3 generic - 96.2 generic - 96.3 gke - 96.2 gke - 96.3 ibm - 96.2 ibm - 96.3 Ubuntu 14.04 ESM generic - 96.2 lowlatency - 96.2 Support Information Livepatches for supported LTS kernels will receive upgrades for a period of up to 13 months after the build date of the kernel. Livepatches for supported HWE kernels which are not based on an LTS kernel version will receive upgrades for a period of up to 9 months after the build date of the kernel, or until the end of support for that kernel’s non-LTS distro release version, whichever is sooner. References - CVE-2023-1380 - CVE-2023-30456 - CVE-2023-31248 - CVE-2023-31436 - CVE-2023-35001