CVE-2021-47361

HIGH
Published May 21, 2024 Modified Dec 26, 2024 CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

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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
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0 https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0 https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499 https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0 https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0 https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499

Frequently Asked Questions

What is CVE-2021-47361? +
In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-47361? +
CVE-2021-47361 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-2021-47361? +
CVE-2021-47361 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-2021-47361? +
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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