---
id: CVE-2026-74373
title: |-
  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_accou…
summary: |-
  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_accou…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bb2a9acefaf9ce5bbc1e70f407e34599233d0243 <
    bcf30e14d2bd509c57e93021b46aedc878896e7b
  - >-
    Linux >= bb2a9acefaf9ce5bbc1e70f407e34599233d0243 <
    bb8d7ea74206b419aa05d7773a15a923b668c9f0
  - >-
    Linux >= bb2a9acefaf9ce5bbc1e70f407e34599233d0243 <
    ba976e3501111d11c550848b3b7341a73035f582
  - Linux 6.6
published: '2026-08-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:45.947'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74373'
references:
  - url: 'https://git.kernel.org/stable/c/ba976e3501111d11c550848b3b7341a73035f582'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bb8d7ea74206b419aa05d7773a15a923b668c9f0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bcf30e14d2bd509c57e93021b46aedc878896e7b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00219
epssPercentile: 0.11533
ingestedAt: '2026-10-15T11:00:41.675Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.