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

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.32/6.9.3. It has been declared as critical. This impacts the function blkcg_rstat_flush of the component blk-cgroup. The manipulation results in memory corruption. This vulnerability is known as CVE-2024-38663. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.32/6.9.3. It has been classified as critical. Affected is the function blkcg_rstat_flush of the component blk-cgroup. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix list corruption from resetting io stat Since commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()"), each iostat instance is added to blkcg percpu list, so blkcg_reset_stats() can't reset the stat instance by memset(), otherwise the llist may be corrupted. Fix the issue by only resetting the counter part.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2024-38663 since 06/21/2024. The exploitability is told to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/03/2025).

The vulnerability scanner Nessus provides a plugin with the ID 213191 (Oracle Linux 8 / 9 : Unbreakable Enterprise kernel (ELSA-2024-12887)), 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 d4a60298ac34/89bb36c72e19/6da668063279 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 (213191). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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