libxenmisc4.11: An issue was discovered in Xen through 4.14.x
CVE-2020-25596 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 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xen's sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.
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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