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CVE-2015-4177

16
FAUCET Score

CVE-2015-4177 is a denial-of-service vulnerability affecting the Linux kernel before version 4.0.5, specifically within the collect_mounts function. Exploitable by local users with user-namespace root access, it allows for a system crash via an MNT_DETACH umount2 system call. Rated as Medium severity (CVSS 5.5), this vulnerability has a low attack complexity but can lead to high availability impact. There is no evidence of active exploitation, no publicly available exploit code in common repositories like Metasploit or ExploitDB, and it has received negligible community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.0.4CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 85th percentile among its peer group of 15,940 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (4)

github_advisoryvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: realtime-kernel

Vendor Advisories (1)

redhatCVE-2015-4177Moderate

kernel: Race conditions in collect_mounts

Jul 1, 2015

References

git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
Vendor Advisory
openwall.com / lists/oss-security/2015/05/29/10
openwall.com / lists/oss-security/2015/05/29/5
bugzilla.redhat.com / show_bug.cgi
github.com / torvalds/linux/commit/cd4a40174b71acd021877341684d8bb1dc8ea4ae
Vendor Advisory
kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.0.5
openwall.com / lists/oss-security/2015/06/04/5