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Fencer Intel
high 8.2

CVE-2015-8550 json

Xen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service (host OS crash) or gain…

published 2016-04-14 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-8430

cvss
8.2
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

Xen, when used on a system providing PV backends, allows local guest OS administrators to cause a denial of service (host OS crash) or gain privileges by writing to memory shared between the frontend and backend, aka a double fetch vulnerability.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.8.0~rc3-1
  • qemu Debian 14, Debian 13, Debian 12 1:2.5+dfsg-2
  • linux Debian 14, Debian 13, Debian 12 4.3.3-3

debian advisories DEBIAN-CVE-2015-8550

  • xen Ubuntu 14.04 LTS 4.4.2-0ubuntu0.14.04.4
  • xen Ubuntu 16.04 LTS 4.6.0-1ubuntu2
  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.22
  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-1ubuntu5
  • linux Ubuntu 14.04 LTS 3.13.0-74.118
  • linux-lts-wily Ubuntu 14.04 LTS 4.2.0-22.27~14.04.1
  • linux-lts-vivid Ubuntu 14.04 LTS 3.19.0-42.48~14.04.1
  • linux-lts-utopic Ubuntu 14.04 LTS 3.16.0-57.77~14.04.1

ubuntu advisories UBUNTU-CVE-2015-8550

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt SLE Real Time 12 SP1 3.12.58-14.1
  • kernel-compute SLE Real Time 12 SP1 3.12.58-14.1
  • kernel-syms-rt SLE Real Time 12 SP1 3.12.58-14.1
  • kernel-rt_debug SLE Real Time 12 SP1 3.12.58-14.1
  • kernel-source-rt SLE Real Time 12 SP1 3.12.58-14.1
  • kernel-compute_debug SLE Real Time 12 SP1 3.12.58-14.1
  • xen SLES for SAP 12, SLES 12, SLED 12 +1 more 4.4.4_02-22.19.1
  • kernel-ec2 SLES 11 SP3-LTSS, OpenStack Cloud 5, Manager Proxy 2.1 +1 more 3.0.101-0.47.79.1

suse advisories SUSE-SU-2016:1764-1SUSE-SU-2016:1745-1SUSE-SU-2016:1318-1SUSE-SU-2016:1203-1SUSE-SU-2016:1154-1SUSE-SU-2016:1102-1

  • xen openSUSE Tumbleweed 4.7.0_12-1.3

opensuse advisories openSUSE-SU-2024:10196-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-8550 updated cvss 7.4

xen: paravirtualized drivers incautious about shared memory contents (XSA-155)

  • Red Hat Enterprise Linux 5 kernel-xen
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.08% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.2 CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 5.7 AV:L/AC:L/Au:S/C:P/I:P/A:C

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.