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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3023 USN-4484-1: Linux kernel vulnerability 3 September 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-14356 Reference: ESB-2020.3010 ESB-2020.3008 Original Bulletin: https://usn.ubuntu.com/4484-1/ - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4484-1: Linux kernel vulnerability 02 September 2020 The system could be made to crash or run programs as an administrator. Releases o Ubuntu 18.04 LTS Packages o linux-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems o linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems o linux-hwe - Linux hardware enablement (HWE) kernel o linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V8) systems Details It was discovered that the cgroup v2 subsystem in the Linux kernel did not properly perform reference counting in some situations, leading to a NULL pointer dereference. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 o linux-image-5.3.0-1032-raspi2 - 5.3.0-1032.34 o linux-image-5.3.0-1034-aws - 5.3.0-1034.36 o linux-image-5.3.0-1034-gke - 5.3.0-1034.36 o linux-image-5.3.0-66-generic - 5.3.0-66.60 o linux-image-5.3.0-66-lowlatency - 5.3.0-66.60 o linux-image-aws - 5.3.0.1034.33 o linux-image-gke-5.3 - 5.3.0.1034.19 o linux-image-gkeop-5.3 - 5.3.0.66.123 o linux-image-raspi2-hwe-18.04 - 5.3.0.1032.22 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-2020-14356 - --------------------------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. 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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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