Linux Kernel up to 4.15-rc3 Crypto Subsystem input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Linux Kernel up to 4.15-rc3 (Operating System). It has been classified as critical. Affected is an unknown code of the component Crypto Subsystem. The manipulation with an unknown input leads to a input validation vulnerability. 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, integrity, and availability. CVE summarizes:

A flaw was found in the crypto subsystem of the Linux kernel before version kernel-4.15-rc4. The "null skcipher" was being dropped when each af_alg_ctx was freed instead of when the aead_tfm was freed. This can cause the null skcipher to be freed while it is still in use leading to a local user being able to crash the system or possibly escalate privileges.

The bug was discovered 08/28/2018. The weakness was shared 08/30/2018 by Florian Weimer as not defined bug report (Bugzilla). The advisory is available at This vulnerability is traded as CVE-2018-14619 since 07/27/2018. Local access is required to approach this attack. A authentication is needed for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118513 (RHEL 7 : kernel-alt (RHSA-2018:2948) (Spectre)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l.

Upgrading to version 4.15-rc4 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118513).







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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NVD Base Score: 7.8
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CNA Base Score: 6.2
CNA Vector (Red Hat, Inc.): 🔍



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Class: Input validation

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Nessus ID: 118513
Nessus Name: RHEL 7 : kernel-alt (RHSA-2018:2948) (Spectre)
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Threat Intelligenceinfo

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Recommended: Upgrade
Status: 🔍

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Upgrade: Kernel 4.15-rc4


07/27/2018 🔍
08/28/2018 +32 days 🔍
08/28/2018 +0 days 🔍
08/30/2018 +1 days 🔍
08/30/2018 +0 days 🔍
08/31/2018 +1 days 🔍
10/30/2018 +60 days 🔍
10/31/2018 +1 days 🔍
05/06/2023 +1648 days 🔍



Advisory: RHSA-2018:2948
Researcher: Florian Weimer
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-14619 (🔍)
SecurityFocus: 105200 - Linux Kernel CVE-2018-14619 Local Denial of Service Vulnerability


Created: 08/31/2018 07:01 AM
Updated: 05/06/2023 09:56 AM
Changes: 08/31/2018 07:01 AM (74), 03/19/2020 03:16 PM (6), 05/06/2023 09:54 AM (5), 05/06/2023 09:56 AM (11)
Complete: 🔍
Cache ID: 44:FD4:40


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