A vulnerability, which was classified as problematic, was found in Linux Kernel (Operating System) (version now known). Affected is the function show_opcodes. The manipulation with an unknown input leads to a input validation vulnerability (Kernel Memory). CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality. CVE summarizes:

A missing address check in the callers of the show_opcodes() in the Linux kernel allows an attacker to dump the kernel memory at an arbitrary kernel address into the dmesg log.

The bug was discovered 08/27/2018. The weakness was published 10/08/2018 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is traded as CVE-2018-14656 since 07/27/2018. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/23/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Similar entries are available at VDB-278761, VDB-278762, VDB-278763 and VDB-278764.

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• Operating System

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• Linux

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• Kernel

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• open-source

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