Description
The do_mmu_update function in arch/x86/mm.c in Xen 3.2.x through 4.4.x does not properly manage page references, which allows remote domains to cause a denial of service by leveraging control over an HVM guest and a crafted MMU_MACHPHYS_UPDATE.
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 | 4.4.1-4 | — |
| Debian 13 | xen | 4.4.1-4 | — |
| Debian 12 | xen | 4.4.1-4 | — |
| Debian 7 | xen | 4.1.4-3+deb7u4 | DSA-3140-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.1-0ubuntu0.14.04.2 | — |
Advisories 1
- DSA-3140-1 xen - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://xenbits.xen.org/xsa/advisory-113.html
- GLSA-201504-04 vendor-advisory
- 62672 third-party-advisory
- xen-mmumachphysupdate-dos(98853) vdb-entry
- DSA-3140 vendor-advisory
- 71207 vdb-entry
- openSUSE-SU-2015:0226 vendor-advisory
- openSUSE-SU-2015:0256 vendor-advisory