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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3684 USN-4144-1: Linux kernel vulnerabilities 2 October 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-15538 CVE-2018-20976 Reference: ESB-2019.3570 ESB-2019.3505.3 Original Bulletin: https://usn.ubuntu.com/4144-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4144-1: Linux kernel vulnerabilities 1 October 2019 linux, linux-aws, linux-aws-hwe, linux-azure, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities A security issue affects these releases of Ubuntu and its derivatives: o Ubuntu 18.04 LTS o Ubuntu 16.04 LTS Summary Several security issues were fixed in the Linux kernel. Software Description o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-kvm - Linux kernel for cloud environments o linux-oem - Linux kernel for OEM processors o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi2 - Linux kernel for Raspberry Pi 2 o linux-snapdragon - Linux kernel for Snapdragon processors o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-hwe - Linux hardware enablement (HWE) kernel Details It was discovered that the XFS file system in the Linux kernel did not properly handle mount failures in some situations. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2018-20976) Benjamin Moody discovered that the XFS file system in the Linux kernel did not properly handle an error condition when out of disk quota. A local attacker could possibly use this to cause a denial of service. (CVE-2019-15538) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1026-oracle - 4.15.0-1026.29 linux-image-4.15.0-1047-kvm - 4.15.0-1047.47 linux-image-4.15.0-1048-raspi2 - 4.15.0-1048.52 linux-image-4.15.0-1051-aws - 4.15.0-1051.53 linux-image-4.15.0-1057-oem - 4.15.0-1057.66 linux-image-4.15.0-1065-snapdragon - 4.15.0-1065.72 linux-image-4.15.0-65-generic - 4.15.0-65.74 linux-image-4.15.0-65-generic-lpae - 4.15.0-65.74 linux-image-4.15.0-65-lowlatency - 4.15.0-65.74 linux-image-aws - 4.15.0.1051.50 linux-image-generic - 4.15.0.65.67 linux-image-generic-lpae - 4.15.0.65.67 linux-image-kvm - 4.15.0.1047.47 linux-image-lowlatency - 4.15.0.65.67 linux-image-oem - 4.15.0.1057.61 linux-image-oracle - 4.15.0.1026.29 linux-image-powerpc-e500mc - 4.15.0.65.67 linux-image-powerpc-smp - 4.15.0.65.67 linux-image-powerpc64-emb - 4.15.0.65.67 linux-image-powerpc64-smp - 4.15.0.65.67 linux-image-raspi2 - 4.15.0.1048.46 linux-image-snapdragon - 4.15.0.1065.68 linux-image-virtual - 4.15.0.65.67 Ubuntu 16.04 LTS linux-image-4.15.0-1026-oracle - 4.15.0-1026.29~16.04.1 linux-image-4.15.0-1051-aws - 4.15.0-1051.53~16.04.1 linux-image-4.15.0-1060-azure - 4.15.0-1060.65 linux-image-4.15.0-65-generic - 4.15.0-65.74~16.04.1 linux-image-4.15.0-65-generic-lpae - 4.15.0-65.74~16.04.1 linux-image-4.15.0-65-lowlatency - 4.15.0-65.74~16.04.1 linux-image-aws-hwe - 4.15.0.1051.51 linux-image-azure - 4.15.0.1060.63 linux-image-generic-hwe-16.04 - 4.15.0.65.85 linux-image-generic-lpae-hwe-16.04 - 4.15.0.65.85 linux-image-lowlatency-hwe-16.04 - 4.15.0.65.85 linux-image-oem - 4.15.0.65.85 linux-image-oracle - 4.15.0.1026.19 linux-image-virtual-hwe-16.04 - 4.15.0.65.85 To update your system, please follow these instructions: https:// wiki.ubuntu.com/Security/Upgrades . 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 o CVE-2018-20976 o CVE-2019-15538 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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