An issue was discovered in Xen through 4.11.x. The logic in oxenstored for
handling writes depended on the order of evaluation of expressions making
up a tuple. As indicated in section 7.7.3 "Operations on data structures"
of the OCaml manual, the order of evaluation of subexpressions is not
specified. In practice, different implementations behave differently. Thus,
oxenstored may not enforce the configured quota-maxentity. This allows a
malicious or buggy guest to write as many xenstore entries as it wishes,
causing unbounded memory usage in oxenstored. This can lead to a
system-wide DoS.
mdeslaurhypervisor packages are in universe. For
issues in the hypervisor, add appropriate
tags to each section, ex:
Tags_xen: universe-binary
Source: xen (LP Ubuntu Debian)
Upstream:released (4.11.1~pre.20180911.5acdd26fdc+dfsg-2)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was needs-triage)
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):needed
Ubuntu 19.04 (Disco Dingo):needed
Ubuntu 19.10 (Eoan Ermine):needed
Ubuntu 20.04 (Focal Fossa):needed
Binaries built from this source package are in universe and so are supported by the community. For more details see
More Information

Updated: 2019-12-05 19:54:00 UTC (commit 0aa5e7c87c8b55d2ec5c7f4ca1179cf75de91961)