VulnerabilityPublished 15 Aug 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in bcf30e14d2bd509c57e93021b46aedc878896e7b : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in bcf30e14d2bd509c57e93021b46aedc878896e7b, bb8d7ea74206b419aa05d7773a15a923b668c9f0, ba976e3501111d11c550848b3b7341a73035f582 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ bb2a9acefaf9ce5bbc1e70f407e34599233d0243, < bcf30e14d2bd509c57e93021b46aedc878896e7b	Fixed in bcf30e14d2bd509c57e93021b46aedc878896e7b
LinuxLinux	Affected ≥ bb2a9acefaf9ce5bbc1e70f407e34599233d0243, < bb8d7ea74206b419aa05d7773a15a923b668c9f0	Fixed in bb8d7ea74206b419aa05d7773a15a923b668c9f0
LinuxLinux	Affected ≥ bb2a9acefaf9ce5bbc1e70f407e34599233d0243, < ba976e3501111d11c550848b3b7341a73035f582	Fixed in ba976e3501111d11c550848b3b7341a73035f582
LinuxLinux	Affected ≥ bb2a9acefaf9ce5bbc1e70f407e34599233d0243, < 235d16ae715104b981a4fbc9434398e3816773b1	Fixed in 235d16ae715104b981a4fbc9434398e3816773b1
LinuxLinux	Affected ≥ bb2a9acefaf9ce5bbc1e70f407e34599233d0243, < 91d0fc000d8cc40fcb4285e6160dd1ce98c56201	Fixed in 91d0fc000d8cc40fcb4285e6160dd1ce98c56201
LinuxLinux	Affected =6.6	Fixed in–

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.

References

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