CVE-2016-1576

high

Published 2016-05-02 · Modified 2026-05-06

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CVSS v3

7.8

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.8

Description

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

Predictions

Exploit likelihood

75%

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.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-41763 local linux

halfdog · 2016-11-22

Ubuntu 15.10 - 'USERNS ' Overlayfs Over Fuse Privilege Escalation

Source code queued for fetch — refresh in a moment.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`4.5.1-1`
debian	bullseye	fixed	`4.5.1-1`
debian	forky	fixed	`4.5.1-1`
debian	sid	fixed	`4.5.1-1`
debian	trixie	fixed	`4.5.1-1`
ubuntu	12.04	affected
ubuntu	14.04	affected
ubuntu	15.10	affected
ubuntu	16.04	affected
ubuntu	16.10	affected
linux-kernel		affected

References

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

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