CVE-2016-9576 Use after free in n/a

What is CVE-2016-9576?

CVE-2016-9576 is a high-severity use after free vulnerability in Linux kernel, published on 28 Dec 2016. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.

Weakness: CWE-416

Which versions are affected by CVE-2016-9576?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2016-9576?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2016-9576 being exploited?

There is no known exploitation of CVE-2016-9576 in the wild and no public exploit code.

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-2016-9576, GHSA-q25h-fm3c-jgp6, UBUNTU-CVE-2016-9576.