CVE-2017-16995 Memory corruption in n/a
Local attackers can exploit incorrect sign extension in the BPF verifier to cause memory corruption, leading to denial of service or potential code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-16995?
CVE-2017-16995 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 22 Dec 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel through 4.4 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging incorrect sign extension.
Weakness: CWE-119
Which versions are affected by CVE-2017-16995?
It affects 3 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel.
How do I fix CVE-2017-16995?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-16995 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-16995 exists.
Public exploit code: 1 Metasploit module, 4 Exploit-DB entries and 15 proofs of concept on GitHub.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2017-16995, GHSA-45mv-5p9c-6w7c, UBUNTU-CVE-2017-16995, USN-3633-1.