Use After Free Affecting kernel-rt-kvm package, versions <0:3.10.0-1160.114.2.rt56.1266.el7


Severity

0.0
high
0
10

    Threat Intelligence

    Exploit Maturity
    Mature
    EPSS
    1.09% (85th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTKVM-6225744
  • published 1 Feb 2024
  • disclosed 31 Jan 2024

How to fix?

Upgrade Centos:7 kernel-rt-kvm to version 0:3.10.0-1160.114.2.rt56.1266.el7 or higher.

NVD Description

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

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

The nft_verdict_init() function allows positive values as drop error within the hook verdict, and hence the nf_hook_slow() function can cause a double free vulnerability when NF_DROP is issued with a drop error which resembles NF_ACCEPT.

We recommend upgrading past commit f342de4e2f33e0e39165d8639387aa6c19dff660.

CVSS Scores

version 3.1
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Snyk

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

7.8 high
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Red Hat

7.8 high
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SUSE

7.8 high