Linux Kernel up to 4.20.10 crypto/af_alg.c af_alg_release use after free

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.5$5k-$25k0.06

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.20.10 (Operating System). This issue affects the function af_alg_release of the file crypto/af_alg.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-416. Impacted is confidentiality, integrity, and availability.

The bug was discovered 02/15/2019. The weakness was disclosed 02/18/2019 (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2019-8912 since 02/18/2019. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/11/2020).

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172169 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2019:0765-1)).

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

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107120). The entries 130266, 130406 and 136769 are pretty similar.

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VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

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Exploitinginfoedit

Class: Memory corruption
CWE: CWE-416
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍

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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfoedit

02/15/2019 🔍
02/18/2019 +3 days 🔍
02/18/2019 +0 days 🔍
02/18/2019 +0 days 🔍
02/19/2019 +1 days 🔍
05/11/2020 +447 days 🔍

Sourcesinfoedit

Vendor: https://www.kernel.org/

Advisory: securityfocus.com
Status: Confirmed

CVE: CVE-2019-8912 (🔍)
SecurityFocus: 107120 - Linux Kernel CVE-2019-8980 Denial of Service Vulnerability

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Entryinfoedit

Created: 02/19/2019 08:20 AM
Updated: 05/11/2020 10:51 AM
Changes: (4) vulnerability_discoverydate advisory_url source_securityfocus_date source_securityfocus_class
Complete: 🔍

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