CVE-2021-3308

Name
CVE-2021-3308
Description
An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Patch http://xenbits.xen.org/xsa/advisory-360.html
Mailing List http://www.openwall.com/lists/oss-security/2021/01/26/4
Third Party Advisory https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S5C42TMQYB6SDVT2MPFEWY65A6RSUVBN/

Match rules

CPE URI Source package Min version Max version
cpe:2.3:o:xen:xen:4.12.3:*:*:*:*:*:*:* xen == None == 4.12.3
cpe:2.3:o:xen:xen:4.12.4:*:*:*:*:*:*:* xen == None == 4.12.4
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* xen >= 4.13.1 <= 4.14.1

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
xen 3.10-main 4.12.4-r0 None possibly vulnerable
xen 3.12-main 4.13.4-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
xen 3.11-main 4.13.4-r0 Natanael Copa <ncopa@alpinelinux.org> fixed