Linux Kernel up to 4.14.7 HMAC crypto/hmac.c System Calls memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Linux Kernel up to 4.14.7 (Operating System). It has been declared as critical. This vulnerability affects an unknown part of the file crypto/hmac.c of the component HMAC. The manipulation as part of a System Calls leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 11/29/2017. The weakness was disclosed 12/20/2017 as confirmed git commit (GIT Repository). The advisory is shared for download at This vulnerability was named CVE-2017-17806 since 12/20/2017. The attack needs to be approached locally. A single authentication is necessary for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 21 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 105433 (Debian DSA-4073-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 237034 (Red Hat Update for kernel-alt (RHSA-2018:2948)).

Upgrading to version 4.14.8 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (105433). The entries 109193, 110288, 110931 and 110933 are pretty similar.






  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
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NVD Base Score: 7.8
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Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Nessus ID: 105433
Nessus Name: Debian DSA-4073-1 : linux - security update
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OpenVAS ID: 61643
OpenVAS Name: SuSE Update for Linux Kernel openSUSE-SU-2018:0022-1 (Linux Kernel)
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Threat Intelligenceinfo

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Recommended: Patch
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Upgrade: Kernel 4.14.8


11/29/2017 🔍
12/20/2017 +21 days 🔍
12/20/2017 +0 days 🔍
12/20/2017 +0 days 🔍
12/20/2017 +0 days 🔍
12/21/2017 +1 days 🔍
12/23/2017 +2 days 🔍
12/26/2017 +3 days 🔍
01/18/2023 +1849 days 🔍



Advisory: RHSA-2018:2948
Researcher: syzbot.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-17806 (🔍)

SecurityFocus: 102293 - Linux Kernel CVE-2017-17806 Stack Based Buffer Overflow Vulnerability

See also: 🔍


Created: 12/21/2017 08:45 AM
Updated: 01/18/2023 02:19 PM
Changes: 12/21/2017 08:45 AM (84), 12/17/2019 08:28 AM (5), 01/27/2021 04:55 PM (2), 01/18/2023 02:19 PM (3)
Complete: 🔍


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