CVE-2016-6516

HIGH

Linux Kernel <4.7 - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-6516. PoCs published by wpengfei.

AI-analyzed exploit summary This repository contains functional exploit code for CVE-2016-6516, a double-fetch vulnerability in the Linux kernel's FIDEDUPERANGE ioctl. The exploit leverages a race condition to manipulate the `dest_count` field during the ioctl call, potentially leading to privilege escalation or denial of service.

Description

Race condition in the ioctl_file_dedupe_range function in fs/ioctl.c in the Linux kernel through 4.7 allows local users to cause a denial of service (heap-based buffer overflow) or possibly gain privileges by changing a certain count value, aka a "double fetch" vulnerability.

Exploits (1)

nomisec WORKING POC 9 stars
by wpengfei · poc
https://github.com/wpengfei/CVE-2016-6516-exploit

This repository contains functional exploit code for CVE-2016-6516, a double-fetch vulnerability in the Linux kernel's FIDEDUPERANGE ioctl. The exploit leverages a race condition to manipulate the `dest_count` field during the ioctl call, potentially leading to privilege escalation or denial of service.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Complex
Reliability
Racy
Target: Linux kernel (versions affected by CVE-2016-6516)
No auth needed
Prerequisites: Access to a vulnerable Linux kernel with the FIDEDUPERANGE ioctl exposed
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/92259
Release Notes mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2016/07/31/6
Issue Tracking, Third Party Advisory, VDB Entry x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1362457

Scores

CVSS v3 7.4
EPSS 0.0095
EPSS Percentile 56.6%
Attack Vector LOCAL
CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-119 CWE-362
Status published
Products (1)
linux/linux_kernel < 4.7
Published Aug 06, 2016
Tracked Since Feb 18, 2026