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NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package kernel-rt-debug  (opens in a new tab)

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EPSS
0.05% (20th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTDEBUG-2316247
  • published11 Dec 2021
  • disclosed19 Oct 2021
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Introduced: 19 Oct 2021

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

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by RHEL.

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.