CVE-2015-3636 Use after free in n/a

What is CVE-2015-3636?

CVE-2015-3636 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 6 Aug 2015. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The ping_unhash function in net/ipv4/ping.c in the Linux kernel before 4.0.3 does not initialize a certain list data structure during an unhash operation, which allows local users to gain privileges or cause a denial of service (use-after-free and system crash) by leveraging the ability to make a SOCK_DGRAM socket system call for the IPPROTO_ICMP or IPPROTO_ICMPV6 protocol, and then making a connect system call after a disconnect.

Which versions are affected by CVE-2015-3636?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2015-3636?

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-2015-3636 being exploited?

There is no known exploitation of CVE-2015-3636 in the wild and no public exploit code.

Public exploit code: 7 proofs of concept on GitHub.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2015-3636, GHSA-67pv-68g5-4j93, RHSA-2015:1583, RHSA-2015:1643, UBUNTU-CVE-2015-3636.