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Out-of-bounds Write Affecting kernel-rt package, versions <0:3.10.0-1062.7.1.rt56.1030.el7

Severity

 Recommended
0.0
high
0
10

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.08% (37th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRT-2150773
  • published 26 Jul 2021
  • disclosed 17 Sep 2019
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Introduced: 17 Sep 2019

CVE-2019-14821 Open this link in a new tab
CWE-787 Open this link in a new tab

How to fix?

Upgrade Centos:7 kernel-rt to version 0:3.10.0-1062.7.1.rt56.1030.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.

References

CVSS Scores

version 3.1
Expand this section

NVD

8.8 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Changed
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High