CVE-2015-2925

Exploitation Summary

EIP tracks 1 public exploit for CVE-2015-2925. PoCs published by Kagami.

AI-analyzed exploit summary This PoC demonstrates a container escape vulnerability (CVE-2015-2925) in Docker by exploiting user namespaces and bind mounts to access the host filesystem. It uses `unshare` to gain root privileges inside the container and manipulate directory structures to escape the bind mount.

Description

The prepend_path function in fs/dcache.c in the Linux kernel before 4.2.4 does not properly handle rename actions inside a bind mount, which allows local users to bypass an intended container protection mechanism by renaming a directory, related to a "double-chroot attack."

Exploits (1)

nomisec WORKING POC 11 stars

by Kagami · poc

https://github.com/Kagami/docker_cve-2015-2925

View Code ZIP pw:eip

This PoC demonstrates a container escape vulnerability (CVE-2015-2925) in Docker by exploiting user namespaces and bind mounts to access the host filesystem. It uses `unshare` to gain root privileges inside the container and manipulate directory structures to escape the bind mount.

Classification

Working Poc 100%

Attack Type

Lpe

Complexity

Moderate

Reliability

Reliable

Target: Docker (versions with user namespace support, tested on 1.6.1)

No auth needed

Prerequisites: Kernel with user namespaces enabled (CONFIG_USER_NS=y) · Docker with --volume mount · unshare utility available in container

MITRE ATT&CK

T1611 - Escape to Host T1068 - Exploitation for Privilege Escalation

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (34)

Core 34

Core References

Third Party Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2015-2636.html

Third Party Advisory vendor-advisory x_refsource_debian

http://www.debian.org/security/2015/dsa-3372

Broken Link mailing-list x_refsource_mlist

http://permalink.gmane.org/gmane.linux.kernel.containers/29173

Third Party Advisory vendor-advisory x_refsource_redhat

http://rhn.redhat.com/errata/RHSA-2016-0068.html

Third Party Advisory x_refsource_confirm

http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?h=f22&id=520b64102de2f184036024b2a53de2b67463bd78

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00009.html

Third Party Advisory vendor-advisory x_refsource_ubuntu

http://www.ubuntu.com/usn/USN-2792-1

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/73926

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00034.html

Third Party Advisory vendor-advisory x_refsource_debian

http://www.debian.org/security/2015/dsa-3364

Third Party Advisory vendor-advisory x_refsource_ubuntu

http://www.ubuntu.com/usn/USN-2794-1

Third Party Advisory vendor-advisory x_refsource_ubuntu

http://www.ubuntu.com/usn/USN-2799-1

Third Party Advisory vendor-advisory x_refsource_ubuntu

http://www.ubuntu.com/usn/USN-2795-1

Third Party Advisory x_refsource_confirm

http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00017.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00007.html

Third Party Advisory x_refsource_confirm

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

Broken Link mailing-list x_refsource_mlist

http://permalink.gmane.org/gmane.linux.kernel.containers/29177

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00019.html

Third Party Advisory x_refsource_confirm

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cde93be45a8a90d8c264c776fab63487b5038a65

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00021.html

Mailing List, Third Party Advisory mailing-list x_refsource_mlist

http://www.openwall.com/lists/oss-security/2015/04/04/4

Vendor Advisory x_refsource_confirm

http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.2.4

Issue Tracking, Third Party Advisory x_refsource_confirm

https://bugzilla.redhat.com/show_bug.cgi?id=1209367

Third Party Advisory x_refsource_confirm

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=397d425dc26da728396e66d392d5dcb8dac30c37

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00020.html

Third Party Advisory x_refsource_confirm

https://github.com/torvalds/linux/commit/cde93be45a8a90d8c264c776fab63487b5038a65

View Writeup ZIP pw:eip

Issue Tracking, Third Party Advisory x_refsource_confirm

https://bugzilla.redhat.com/show_bug.cgi?id=1209373

Third Party Advisory x_refsource_confirm

https://github.com/torvalds/linux/commit/397d425dc26da728396e66d392d5dcb8dac30c37

View Writeup ZIP pw:eip

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00022.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00018.html

Third Party Advisory vendor-advisory x_refsource_ubuntu

http://www.ubuntu.com/usn/USN-2798-1

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00018.html

Linux kernel <4.2.4 - Privilege Escalation

Exploitation Summary

Description

Exploits (1)

References (34)

Scores

Details