Description
Xen 4.4.x, 4.5.x, and 4.6.x does not limit the number of printk console messages when reporting unimplemented hypercalls, which allows local guests to cause a denial of service via a sequence of (1) HYPERVISOR_physdev_op hypercalls, which are not properly handled in the do_physdev_op function in arch/arm/physdev.c, or (2) HYPERVISOR_hvm_op hypercalls, which are not properly handled in the do_hvm_op function in arch/arm/hvm.c.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xen | 4.6.0-1 | — |
| Debian 13 | xen | 4.6.0-1 | — |
| Debian 12 | xen | 4.6.0-1 | — |
| Debian 8 | xen | 4.4.1-9+deb8u3 | DSA-3414-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.2-0ubuntu0.14.04.3 | — |
Advisories 1
- DSA-3414-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://xenbits.xen.org/xsa/advisory-146.html
- FEDORA-2015-242be2c240 vendor-advisory
- FEDORA-2015-a931b02be2 vendor-advisory
- DSA-3414 vendor-advisory
- FEDORA-2015-6f6b79efe2 vendor-advisory
- GLSA-201604-03 vendor-advisory
- 1034029 vdb-entry