Description
Xen 4.4.x, when running on an ARM system and "handling an unknown system register access from 64-bit userspace," returns to an instruction of the trap handler for kernel space faults instead of an instruction that is associated with faults in 64-bit userspace, which allows local guest users to cause a denial of service (crash) and possibly gain privileges via a crafted process.
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 | 4.4.1-1 | — |
| Debian 13 | xen | 4.4.1-1 | — |
| Debian 12 | xen | 4.4.1-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | xen | 4.4.1-0ubuntu0.14.04.3 | — |
References
- 59934 third-party-advisory
- xen-cve20145148-dos(95233) vdb-entry
- http://xenbits.xenproject.org/xsa/advisory-103.html
- 1030725 vdb-entry
- 69189 vdb-entry