CVE-2024-38629: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Avoid unnecessary destruction of file_ida file_ida is allocated during cdev open and is freed accordingly during cdev release. This sequence is guaranteed by driver file operations. Therefore, there is no need to destroy an already empty file_ida when the WQ cdev is removed. Worse, ida_free() in cdev release may happen after destruction of file_ida per WQ cdev. This can lead to accessing an id in file_ida after it has been destroyed, resulting in a kernel panic. Remove ida_destroy(&file_ida) to address these issues.

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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	Versions
linux	linux_kernel	6.4 — 6.6.33
linux	linux_kernel	6.7 — 6.9.4

References

Advisories & Patches

https://git.kernel.org/stable/c/15edb906211bf53e7b5574f7326ab734d6bff4f9 https://git.kernel.org/stable/c/76e43fa6a456787bad31b8d0daeabda27351a480 https://git.kernel.org/stable/c/9eb15f24a0b9b017b39cde8b8c07243676b63687 https://git.kernel.org/stable/c/15edb906211bf53e7b5574f7326ab734d6bff4f9 https://git.kernel.org/stable/c/76e43fa6a456787bad31b8d0daeabda27351a480 https://git.kernel.org/stable/c/9eb15f24a0b9b017b39cde8b8c07243676b63687

Frequently Asked Questions

What is CVE-2024-38629? +

In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Avoid unnecessary destruction of file_ida file_ida is allocated during cdev open and is freed accordingly during cdev release. This sequence is guaranteed by driver file operations. Therefore, there is no need to destroy an already empty file_ida when the WQ cdev is removed. Worse, ida_free() in cdev release may happen after destruction of file_ida per WQ cdev. This can lead to accessing an id in file_ida after it has been destroyed, resulting in a kernel panic. Remove ida_destroy(&file_ida) to address these issues. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-38629? +

CVE-2024-38629 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-2024-38629? +

CVE-2024-38629 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-2024-38629? +

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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