VIR Vulnerability Intelligence Relay

CVE-2016-3158

low
Published 2016-04-13 · Modified 2026-05-06
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
3.8
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CVSS v4 NEW
—
not yet in upstream
VIR risk
3.8

Description

The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.

Predictions

Exploit likelihood
38%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact
fedora Fedora Affected 2 releases
VersionStatusFixed in
23 Affected —
22 Affected —
debian Debian Fixed 5 releases
VersionStatusFixed in
trixie Fixed 4.8.0~rc3-1
sid Fixed 4.8.0~rc3-1
forky Fixed 4.8.0~rc3-1
bullseye Fixed 4.8.0~rc3-1
bookworm Fixed 4.8.0~rc3-1

References

CWEs

CWE-200 CWE-284

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.