Linux Kernel up to 6.6.32/6.9.3 blk-cgroup __blkcg_rstat_flush memory corruption

Summaryinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.6.32/6.9.3. This affects the function __blkcg_rstat_flush of the component blk-cgroup. Executing a manipulation can lead to memory corruption. This vulnerability is registered as CVE-2024-38384. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.32/6.9.3. It has been declared as critical. This vulnerability affects the function __blkcg_rstat_flush of the component blk-cgroup. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix list corruption from reorder of WRITE ->lqueued __blkcg_rstat_flush() can be run anytime, especially when blk_cgroup_bio_start is being executed. If WRITE of `->lqueued` is re-ordered with READ of 'bisc->lnode.next' in the loop of __blkcg_rstat_flush(), `next_bisc` can be assigned with one stat instance being added in blk_cgroup_bio_start(), then the local list in __blkcg_rstat_flush() could be corrupted. Fix the issue by adding one barrier.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2024-38384 since 06/21/2024. The exploitation appears to be easy. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/24/2025).

The vulnerability scanner Nessus provides a plugin with the ID 212049 (RHEL 9 : kernel (RHSA-2024:10771)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.33 or 6.9.4 eliminates this vulnerability. Applying the patch 714e59b5456e/785298ab6b80/d0aac2363549 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.

The vulnerability is also documented in the vulnerability database at Tenable (212049). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.9.0
• 6.9.1
• 6.9.2
• 6.9.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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