CVE-2016-3159

low

Published 2016-04-13 · Modified 2026-05-06

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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 fpu_fxrstor function in arch/x86/i387.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 Affected 2 releases

Version	Status	Fixed in
23	Affected	—
22	Affected	—

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Mixed 6 releases

Version	Status	Fixed 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`
8.0	Affected	—

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.