What is CVE-2015-4177?

CVE-2015-4177 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2015-4177 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2015-4177?

CVE-2015-4177 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2015-4177?

No patch is currently available for CVE-2015-4177. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2015-4177 actively exploited?

CVE-2015-4177 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2015-4177

Medium

The collect_mounts function in fs/namespace.c in the Linux kernel before 4.0.5 does not properly consider that it may execute after a path has been unmounted, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call.

Package Linux Kernel

Published 2016-05-02

Last modified 2026-05-06

CVSS version 3.0

Patch available

Awaiting data

CVSS 3.0 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

The following references provide additional information about CVE-2015-4177 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Openwall
http://openwall.com/lists/oss-security/2015/05/29/10
Openwall
http://openwall.com/lists/oss-security/2015/05/29/5
Kernel.org
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5
Openwall
http://www.openwall.com/lists/oss-security/2015/06/04/5
Red Hat
https://bugzilla.redhat.com/show_bug.cgi?id=1248486
Kernel patch commit
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cd4a40174b71acd021877341684d8bb1dc8ea4ae
Patch
Kernel patch commit
https://github.com/torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae
Patch

Details

CVE ID CVE-2015-4177

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.0

Published 2016-05-02

Modified 2026-05-06

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2015-4177?

CVE-2015-4177 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2015-4177 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2015-4177?

CVE-2015-4177 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.0). The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2015-4177?

No patch is currently available for CVE-2015-4177. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2015-4177 actively exploited?

No — CVE-2015-4177 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.