NULL Pointer Dereference Affecting kernel-devel package, versions <0:2.6.32-754.29.2.el6


Severity

Recommended
high

Based on CentOS security rating.

Threat Intelligence

EPSS
0.8% (83rd percentile)

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  • Snyk IDSNYK-CENTOS6-KERNELDEVEL-2160150
  • published26 Jul 2021
  • disclosed12 May 2020

Introduced: 12 May 2020

CVE-2020-10711  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Centos:6 kernel-devel to version 0:2.6.32-754.29.2.el6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-devel package and not the kernel-devel package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

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.

CVSS Scores

version 3.1