VIR Vulnerability Intelligence Relay

CVE-2016-4020

medium
Published 2016-05-25 · Modified 2026-05-06
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CVSS v3
6.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS v4 NEW
—
not yet in upstream
VIR risk
6.5

Description

The patch_instruction function in hw/i386/kvmvapic.c in QEMU does not initialize the imm32 variable, which allows local guest OS administrators to obtain sensitive information from host stack memory by accessing the Task Priority Register (TPR).

Predictions

Exploit likelihood
65%
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
redhat Red Hat Affected 5 releases
VersionStatusFixed in
7.7 Affected —
7.6 Affected —
7.5 Affected —
7.4 Affected —
7.0 Affected —
suse SUSE Affected 1 release
VersionStatusFixed in
— Affected —
ubuntu Ubuntu Affected 4 releases
VersionStatusFixed in
16.04 Affected —
15.10 Affected —
14.04 Affected —
12.04 Affected —
debian Debian Mixed 6 releases
VersionStatusFixed in
trixie Fixed 1:2.6+dfsg-2
sid Fixed 1:2.6+dfsg-2
forky Fixed 1:2.6+dfsg-2
bullseye Fixed 1:2.6+dfsg-2
bookworm Fixed 1:2.6+dfsg-2
8.0 Affected —

Application impact
VendorProductVersionsFixed
qemuqemu{"endIncluding":"2.6.2"}
redhat redhatopenstack6.0
redhat redhatopenstack7.0
redhat redhatopenstack8
redhat redhatopenstack9
redhat redhatopenstack10
redhat redhatopenstack11
redhat redhatvirtualization4.0

References

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

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