Linux Kernel up to 5.13.12 6pack.c decode_data out-of-bounds write

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CVSS Meta Temp Score
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CTI Interest Score
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8.4$5k-$25k0.27

A vulnerability was found in Linux Kernel up to 5.13.12 (Operating System). It has been declared as critical. This vulnerability affects the function decode_data of the file drivers/net/hamradio/6pack.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-787. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.

The weakness was presented 10/05/2021. The advisory is available at git.kernel.org. This vulnerability was named CVE-2021-42008 since 10/04/2021. The exploitation appears to be easy. The attack can be initiated remotely. The successful exploitation requires a single authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 10/08/2021).

Upgrading to version 5.13.13 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying the patch 19d1532a187669ce86d5a2696eb7275310070793 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-787
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.13.13
Patch: 19d1532a187669ce86d5a2696eb7275310070793

Timelineinfoedit

10/04/2021 CVE assigned
10/05/2021 +1 days Advisory disclosed
10/05/2021 +0 days VulDB entry created
10/08/2021 +3 days VulDB last update

Sourcesinfoedit

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

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2021-42008 (🔒)

Entryinfoedit

Created: 10/05/2021 07:27 AM
Updated: 10/08/2021 06:01 PM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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