Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0068 USN-4678-1: Linux kernel vulnerabilities 7 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Ubuntu Operating System: Ubuntu Linux variants Impact/Access: Increased Privileges -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-29534 CVE-2020-12912 Original Bulletin: https://ubuntu.com/security/notices/USN-4678-1 Comment: This advisory references vulnerabilities in the Linux kernel that also affect distributions other than Ubuntu. It is recommended that administrators running Linux check for an updated version of the kernel for their system. - --------------------------BEGIN INCLUDED TEXT-------------------- USN-4678-1: Linux kernel vulnerabilities 06 January 2021 Several security issues were fixed in the Linux kernel. Releases o Ubuntu 20.10 o Ubuntu 20.04 LTS Packages o linux - Linux kernel o linux-aws - Linux kernel for Amazon Web Services (AWS) systems o linux-azure - Linux kernel for Microsoft Azure Cloud systems o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems o linux-hwe-5.8 - Linux hardware enablement (HWE) kernel o linux-kvm - Linux kernel for cloud environments o linux-oracle - Linux kernel for Oracle Cloud systems o linux-raspi - Linux kernel for Raspberry Pi (V8) systems Details It was discovered that the AMD Running Average Power Limit (RAPL) driver in the Linux kernel did not properly restrict access to power data. A local attacker could possibly use this to expose sensitive information. (CVE-2020-12912) Jann Horn discovered that the io_uring subsystem in the Linux kernel did not properly perform reference counting in some situations. A local attacker could use this to expose sensitive information or possibly escalate privileges. (CVE-2020-29534) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10 o linux-image-5.8.0-1011-raspi - 5.8.0-1011.14 o linux-image-5.8.0-1011-raspi-nolpae - 5.8.0-1011.14 o linux-image-5.8.0-1014-kvm - 5.8.0-1014.15 o linux-image-5.8.0-1014-oracle - 5.8.0-1014.14 o linux-image-5.8.0-1015-gcp - 5.8.0-1015.15 o linux-image-5.8.0-1016-azure - 5.8.0-1016.17 o linux-image-5.8.0-1017-aws - 5.8.0-1017.18 o linux-image-5.8.0-34-generic - 5.8.0-34.37 o linux-image-5.8.0-34-generic-64k - 5.8.0-34.37 o linux-image-5.8.0-34-generic-lpae - 5.8.0-34.37 o linux-image-5.8.0-34-lowlatency - 5.8.0-34.37 o linux-image-aws - 5.8.0.1017.19 o linux-image-azure - 5.8.0.1016.16 o linux-image-gcp - 5.8.0.1015.15 o linux-image-generic - 5.8.0.34.39 o linux-image-generic-64k - 5.8.0.34.39 o linux-image-generic-lpae - 5.8.0.34.39 o linux-image-gke - 5.8.0.1015.15 o linux-image-kvm - 5.8.0.1014.16 o linux-image-lowlatency - 5.8.0.34.39 o linux-image-oracle - 5.8.0.1014.14 o linux-image-raspi - 5.8.0.1011.14 o linux-image-raspi-nolpae - 5.8.0.1011.14 o linux-image-virtual - 5.8.0.34.39 Ubuntu 20.04 o linux-image-5.8.0-34-generic - 5.8.0-34.37~20.04.2 o linux-image-5.8.0-34-generic-lpae - 5.8.0-34.37~20.04.2 o linux-image-5.8.0-34-lowlatency - 5.8.0-34.37~20.04.2 o linux-image-generic-hwe-20.04 - 5.8.0.34.37~20.04.20 o linux-image-generic-lpae-hwe-20.04 - 5.8.0.34.37~20.04.20 o linux-image-lowlatency-hwe-20.04 - 5.8.0.34.37~20.04.20 o linux-image-virtual-hwe-20.04 - 5.8.0.34.37~20.04.20 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-2020-12912 o CVE-2020-29534 - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX/Zg3ONLKJtyKPYoAQjnMRAAjfSk7f3eVENdOVAwVlITyoqXDgK2HJlW MIpEiqRfNhaWtLP6dpu67E3vesFP6Pap4YS1oGLhstIGwm9bGVus6pxk5wUduFDk yZXFT+nih/uv2Gkp3EzlHxKP/t44RF42XIBe5pC81w5KqK2spDG4iw8hDBUX93W3 1cnZNiaE2jCd+ZkCKlyXwM1i/7xMs4dnNwAH5Fyd+zcWKgnNcDeqMLEF4+/fwDac QQZ2M7GxCE+AiPsHxMGZ7lOqCT3GTehfEWptCcu2/2wsN2Cy8Yk2WAhy1yDBna93 sMxXsY0xdTvhasA1Om941uzaGQh/eSfWaSqWN6hOoGEZWRUDh6aDY5+9VlBAIsDm b5ejK0Ug1jl1u5IlPyzsmPNgCmb1lwc2+j2/19g4faOjaxm/N69L8NmVwAxkmmo6 7WsykFlZQb6i3bIXQVAQd5PrFErdiBFGpAbUvxRrPsEguayXfELk1QpjMF3H/2kb K6NvKYHj2Z1fbNWe7fCdaBdVYpmiwxzlQ4y615PlQXK/udTEer+9M5oqyOTfPdkU dhFJ6QbA6/m6UN8d0pCBdWxZzgbSSGZKVwr0oX3whvtvzHtVQKJSgIcna0hgYAkH CRCfHY7tCpC+UHFbAVWqggbUv2/6E4d7cPWxleIKMgVodiPdXMMsE9z+XAOUAEAc M2OI9/GFwoc= =eLlD -----END PGP SIGNATURE-----