CVE-2021-47058

HIGH
Published Feb 29, 2024 Modified Dec 10, 2024 CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/2dc1554d5f0fdaf47cc5bea442b84b9226fea867 https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52 https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268 https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6 https://git.kernel.org/stable/c/2dc1554d5f0fdaf47cc5bea442b84b9226fea867 https://git.kernel.org/stable/c/b9e569ae1da3a113b3acee8703c94777fd20938a https://git.kernel.org/stable/c/c764e375ae647832de1ee73d43a4bb3ef8a8f43d https://git.kernel.org/stable/c/d8897f7b2283a500666c85ef06e820df38ed7b52 https://git.kernel.org/stable/c/e41a962f82e7afb5b1ee644f48ad0b3aee656268 https://git.kernel.org/stable/c/eb949f891226c012138ffd9df90d1e509f428ae6

Frequently Asked Questions

What is CVE-2021-47058? +
In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-47058? +
CVE-2021-47058 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2021-47058? +
CVE-2021-47058 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-2021-47058? +
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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