NULL Pointer Dereference Affecting kernel-uek-modules-extra package, versions <0:5.15.0-0.30.19.el8uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-ORACLE8-KERNELUEKMODULESEXTRA-2939571
  • published2 Jul 2022
  • disclosed10 Mar 2022

Introduced: 10 Mar 2022

CVE-2021-4095  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Oracle:8 kernel-uek-modules-extra to version 0:5.15.0-0.30.19.el8uek or higher.
This issue was patched in ELSA-2022-9533.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-modules-extra package and not the kernel-uek-modules-extra package as distributed by Oracle. See How to fix? for Oracle:8 relevant fixed versions and status.

A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions prior to 5.17-rc1.

CVSS Scores

version 3.1