What’s Vulnerable › Vulnerabilities

CVE-2026-74373: md/raid1,raid10: fix bio accounting for split md cloned bios

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid1,raid10: fix bio accounting for split md cloned bios Use md_cloned_bio() to control bio accounting instead of relying on r1bio_existed in raid1 or the io_accounting flag in raid10. The previous logic does not reliably reflect whether a bio is an md cloned bio. When a failed bio is split and resubmitted via bio_submit_split_bioset() on the error path, this can lead to either double accounting for md cloned bios, or missing accounting for bios returned from bio_submit_split_bioset() Fix this by using md_cloned_bio() to detect md cloned bios and skip accounting accordingly.

Affected products

• Linux kernel: 6.6 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/235d16ae715104b981a4fbc9434398e3816773b1
• https://git.kernel.org/stable/c/91d0fc000d8cc40fcb4285e6160dd1ce98c56201
• https://git.kernel.org/stable/c/ba976e3501111d11c550848b3b7341a73035f582
• https://git.kernel.org/stable/c/bb8d7ea74206b419aa05d7773a15a923b668c9f0
• https://git.kernel.org/stable/c/bcf30e14d2bd509c57e93021b46aedc878896e7b

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