CVE-2018-15858 Null dereference in n/a

What is CVE-2018-15858?

CVE-2018-15858 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 25 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Unchecked NULL pointer usage when handling invalid aliases in CopyKeyAliasesToKeymap in xkbcomp/keycodes.c in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file.

Weakness: CWE-476

Which versions are affected by CVE-2018-15858?

It affects 3 products.

Products include Canonical Ubuntu Linux, Xkbcommon Libxkbcommon, Xkbcommon Xkbcommon.

How do I fix CVE-2018-15858?

Upgrade to a fixed version.

Is CVE-2018-15858 being exploited?

There is no known exploitation of CVE-2018-15858 in the wild and no public exploit code.

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-2018-15858, GHSA-4rvw-gf8w-hj4x, UBUNTU-CVE-2018-15858.