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CVE Record

CVE-2024-27023: md: Fix missing release of 'active_io' for flush

In the Linux kernel, the following vulnerability has been resolved: md: Fix missing release of 'active_io' for flush submit_flushes atomic_set(&mddev->flush_pending, 1); rdev_for_each_rcu(rdev, mddev) atomic_inc(&mddev->flush_pending); bi->bi_end_io = md_end_flush submit_bio(bi); /* flush io is done first */ md_end_flush if (atomic_dec_and_test(&mddev->flush_pending)) percpu_ref_put(&mddev->active_io) -> active_io is not released if (atomic_dec_and_test(&mddev->flush_pending)) -> missing release of active_io For consequence, mddev_suspend() will wait for 'active_io' to be zero forever. Fix this problem by releasing 'active_io' in submit_flushes() if 'flush_pending' is decreased to zero.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-27023 is a Linux kernel md RAID bug where flush handling can leave an internal I/O reference unreleased. The stated result is that mddev_suspend() may wait forever, causing a hang in affected storage-management paths. This is primarily an availability risk, not evidence of data theft or remote compromise.

Executive priority

Treat as routine-to-priority infrastructure patching for Linux storage hosts. Escalate if critical services depend on md RAID or if operational hangs have been observed. Current sources do not justify emergency response absent affected exposure.

Technical view

In Linux kernel md submit_flushes(), active_io can remain held when flush_pending drops to zero outside md_end_flush. The resolved fix releases active_io in submit_flushes() for that path. The source bundle does not provide CVSS, CWE, complete affected ranges, or evidence of exploitation.

Likely exposure

Exposure is likely limited to Linux systems using the md subsystem, commonly software RAID. The bundle names Linux kernel versions and stable fix commits, but does not clearly express complete affected version ranges. Kernel package provenance matters.

Exploitation context

No active exploitation is supported by the supplied sources, and KEV is false. The described impact is a kernel storage subsystem hang during suspend behavior, which could create local denial-of-service conditions in affected configurations.

Researcher notes

The evidence is strongest for root cause and fix direction: missing active_io release around flush_pending handling. Public metadata lacks CVSS, CWE, complete affected ranges, and exploitation detail, so validation should rely on kernel/vendor advisories and commit presence.

Mitigation direction

  • Review vendor kernel advisories for CVE-2024-27023 applicability.
  • Update to a vendor kernel containing the referenced md fixes.
  • Prioritize systems using Linux md software RAID.
  • Schedule storage host reboots according to normal kernel patch procedures.

Validation and detection

  • Inventory Linux hosts using the md subsystem or software RAID.
  • Compare running kernel versions against vendor CVE guidance.
  • Confirm installed kernel includes one of the referenced stable fixes.
  • Monitor for storage suspend or RAID management hangs before patching.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-27023 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxf9f2d957a8ea93c73182aebf7de30935a58c027d, 530cec617f5a8ba6f26bcbf0d64d75c951d17730, c4c2345214b66e2505a26fd2ea58839dd7a1d48d, fa2bbff7b0b4e211fec5e5686ef96350690597b5unaffected
LinuxLinux6.1.75, 6.6.14, 6.7.2unaffected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.