CVE-2020-10711 Null dereference in Kernel

What is CVE-2020-10711?

CVE-2020-10711 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 22 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

Weakness: CWE-476

Which versions are affected by CVE-2020-10711?

It affects 11 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Opensuse Leap, Redhat 3scale, Redhat Enterprise Linux and 5 more.

How do I fix CVE-2020-10711?

Upgrade to a fixed version.

Is CVE-2020-10711 being exploited?

There is no known exploitation of CVE-2020-10711 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
• How this page is made

Also known as DEBIAN-CVE-2020-10711, RHSA-2020:2103, RHSA-2020:2125, UBUNTU-CVE-2020-10711.