drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in Linux
Name: |
Mehrere Probleme in Linux |
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ID: |
USN-5082-1 |
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Distribution: |
Ubuntu |
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Plattformen: |
Ubuntu 20.04 LTS |
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Datum: |
Fr, 17. September 2021, 07:19 |
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Referenzen: |
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3653
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3656
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3609 |
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Applikationen: |
Linux |
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Originalnachricht |
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========================================================================== Ubuntu Security Notice USN-5082-1 September 16, 2021
linux-oem-5.13 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description: - linux-oem-5.13: Linux kernel for OEM systems
Details:
Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. (CVE-2021-3656)
Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. (CVE-2021-3653)
Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.13.0-1012-oem 5.13.0-1012.16 linux-image-oem-20.04c 5.13.0.1012.16
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: https://ubuntu.com/security/notices/USN-5082-1 CVE-2021-3609, CVE-2021-3653, CVE-2021-3656
Package Information: https://launchpad.net/ubuntu/+source/linux-oem-5.13/5.13.0-1012.16
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