Linux Kernel up to 7.1.4 md/raid1/raid10 drivers/md/raid1.c md_cloned_bio resource consumption

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 7.1.4. The affected element is the function md_cloned_bio of the file drivers/md/raid1.c of the component md/raid1/raid10. The manipulation results in resource consumption. This vulnerability is known as CVE-2026-74374. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 7.1.4. Affected is the function md_cloned_bio of the file drivers/md/raid1.c of the component md/raid1/raid10. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: md/raid1,raid10: fix error-path detection with md_cloned_bio() Detect the error path using md_cloned_bio() instead of relying on r1_bio in raid1 or r10_bio->read_slot in raid10, which may be NULL or -1 after splitting and resubmitting a failed bio. As a result, the error path may not be recognized and memory allocations can incorrectly use GFP_NOIO instead of (GFP_NOIO | __GFP_HIGH), which can lead to a deadlock under memory pressure.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-74374 since 08/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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 08/15/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 20fb582c92fd64e5c8bd83c6176264b2794603b7/811545e0926d02a6a0b1a1258bb5544777c164d4 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4

License

• open-source

Website

• Vendor: https://www.kernel.org/

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