Public proof of conceptFix available

CVE-2015-8660

Q: Is CVE-2015-8660 actively exploited?

Active exploitation of CVE-2015-8660 has not been confirmed. Its EPSS score was 22.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2015-8660?

CVE-2015-8660 has a CVSS v3 base score of 6.7 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2015-12-28
Fixed in4.4 · 4.1.22 · 3.18.31
WeaknessCWE-264

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel through 4.3.3 attempts to merge distinct setattr operations, which allows local users to bypass intended access restrictions and modify the attributes of arbitrary overlay files via a crafted application.

Timeline

dates in UTC

2015-12-2811:59CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-8660?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-8660?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Linux linux kernel

Branch	Affected	Fixed in	Source
4.x	≥ 4.2, < 4.4	4.4	NVD
4.1	≥ 3.19, < 4.1.22	4.1.22	NVD
3.18	≥ 3.18, < 3.18.31	3.18.31	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Linux linux kernel to 4.4 · 4.1.22 · 3.18.31

Advisories and patches

git.kernel.orgVendor Advisory
github.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: EDB-39166 EDB-39230 EDB-40688
Proof-of-concept repositories: 3 repositories, unverifiedwhu-enjoy/CVE-2015-8660nhamle2/CVE-2015-8660carradolly/CVE-2015-8660

Sources

NVDCVSS 3.16.7read 2026-10-23
NVDCVSS 2.07.2read 2026-10-23
NVDweakness (CWE)CWE-264read 2026-10-23
FIRST EPSSEPSS score22.2 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23
Exploit-DBdetectionread 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2015-12-28
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-8660?

Is CVE-2015-8660 actively exploited?

Active exploitation of CVE-2015-8660 has not been confirmed. Its EPSS score was 22.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-8660?

CVE-2015-8660 has a CVSS v3 base score of 6.7 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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