CVE-2016-6516 Race condition in n/a

What is CVE-2016-6516?

CVE-2016-6516 is a high-severity vulnerability in Linux kernel, published on 6 Aug 2016. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362, CWE-119

Which versions are affected by CVE-2016-6516?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2016-6516?

Apply the vendor's patch.

Is CVE-2016-6516 being exploited?

There is no known exploitation of CVE-2016-6516 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-6516, GHSA-j5cv-c6j4-5gv8.