CVE-2021-47143: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: remove device from smcd_dev_list after failed device_add() If the device_add() for a smcd_dev fails, there's no cleanup step that rolls back the earlier list_add(). The device subsequently gets freed, and we end up with a corrupted list. Add some error handling that removes the device from the list.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-459 CWE-459

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.19 — 5.10.42
linux	linux_kernel	5.11 — 5.12.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/40588782f1016c655ae1d302892f61d35af96842 https://git.kernel.org/stable/c/444d7be9532dcfda8e0385226c862fd7e986f607 https://git.kernel.org/stable/c/8b2cdc004d21a7255f219706dca64411108f7897 https://git.kernel.org/stable/c/40588782f1016c655ae1d302892f61d35af96842 https://git.kernel.org/stable/c/444d7be9532dcfda8e0385226c862fd7e986f607 https://git.kernel.org/stable/c/8b2cdc004d21a7255f219706dca64411108f7897

Frequently Asked Questions

What is CVE-2021-47143? +

In the Linux kernel, the following vulnerability has been resolved: net/smc: remove device from smcd_dev_list after failed device_add() If the device_add() for a smcd_dev fails, there's no cleanup step that rolls back the earlier list_add(). The device subsequently gets freed, and we end up with a corrupted list. Add some error handling that removes the device from the list. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47143? +

CVE-2021-47143 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2021-47143? +

CVE-2021-47143 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-47143? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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