CVE-2016-4439

medium

Published 2016-05-20 · Modified 2026-05-06

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CVSS v3

6.7

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

6.7

Description

The esp_reg_write function in hw/scsi/esp.c in the 53C9X Fast SCSI Controller (FSC) support in QEMU does not properly check command buffer length, which allows local guest OS administrators to cause a denial of service (out-of-bounds write and QEMU process crash) or potentially execute arbitrary code on the QEMU host via unspecified vectors.

Predictions

Exploit likelihood

66%

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

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Ubuntu Affected 3 releases

Version	Status	Fixed in
16.04	Affected	—
14.04	Affected	—
12.04	Affected	—

Debian Mixed 6 releases

Version	Status	Fixed 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

Vendor	Product	Versions	Fixed
qemu	qemu	`{"endIncluding":"2.6.0"}`

References

CWEs

CWE-119

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

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