libxencall1: An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad...
CVE-2020-11743 is fixed in 22 products on 1 platform, first by libxencall1 4.11.3+24-g14b62ab3e5-1ubuntu2.3, released September 23, 2020. It is not reported as exploited. Patch Radar priority: Routine.
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libxencall1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxencall1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxendevicemodel1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxendevicemodel1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxenevtchn1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxenevtchn1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxenforeignmemory1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxenforeignmemory1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxengnttab1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxengnttab1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxenmisc4.11 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxenmisc4.11 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxenstore3.0 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxenstore3.0 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxentoolcore1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxentoolcore1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| libxentoollog1 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | libxentoollog1 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.11-amd64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.11-amd64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.11-arm64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.11-arm64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.11-armhf · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.11-armhf 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.9-amd64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.9-amd64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.9-arm64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.9-arm64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-4.9-armhf · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-4.9-armhf 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-hypervisor-common · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-hypervisor-common 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-system-amd64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-system-amd64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-system-arm64 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-system-arm64 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-system-armhf · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-system-armhf 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-utils-4.11 · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-utils-4.11 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xen-utils-common · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xen-utils-common 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
| xenstore-utils · Ubuntu 20.04 LTS (focal) | 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | xenstore-utils 4.11.3+24-g14b62ab3e5-1ubuntu2.3 | Sep 23, 2020 |
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