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CVE Record

CVE-2024-26844: block: Fix WARNING in _copy_from_iter

In the Linux kernel, the following vulnerability has been resolved: block: Fix WARNING in _copy_from_iter Syzkaller reports a warning in _copy_from_iter because an iov_iter is supposedly used in the wrong direction. The reason is that syzcaller managed to generate a request with a transfer direction of SG_DXFER_TO_FROM_DEV. This instructs the kernel to copy user buffers into the kernel, read into the copied buffers and then copy the data back to user space. Thus the iovec is used in both directions. Detect this situation in the block layer and construct a new iterator with the correct direction for the copy-in.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel block-layer flaw where an unusual bidirectional data-transfer request could make the kernel handle a user buffer in the wrong direction and trigger a warning. The public record does not provide CVSS, CWE, exploit evidence, or a clear business-impact statement.

Executive priority

Treat this as a kernel maintenance item unless your Linux vendor rates it higher. There is no sourced evidence of active exploitation or confirmed severe impact, but unpatched kernel issues should still be handled through normal patch cycles.

Technical view

The issue involves _copy_from_iter and SG_DXFER_TO_FROM_DEV requests. The source says the same iovec was used for both copy-in and copy-back. The kernel fix detects this case in the block layer and constructs a new iterator with the correct direction for copy-in.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions or vendor kernels that have not backported the listed stable fixes. The source bundle does not identify affected distributions, remote attack paths, required privileges, or affected hardware configurations.

Exploitation context

The source attributes discovery to Syzkaller and marks KEV as false. No provided source states active exploitation. The available description shows a kernel warning condition from a generated request, but does not establish practical exploitation or business impact.

Researcher notes

Evidence is incomplete: no CVSS, CWE, exploit status, affected distributions, or privilege requirements are provided. Focus on commit presence, vendor backports, and whether local workloads expose block or SCSI generic paths that can create bidirectional transfer requests.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • Check distribution advisories for backported fixes and package names.
  • Prioritize internet-facing or multi-tenant Linux systems if vendor guidance raises severity.
  • Avoid direct wrangler-style assumptions; use vendor kernel guidance for remediation timing.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and images.
  • Confirm whether vendor kernels include the referenced stable commits.
  • Check vulnerability scanner findings against distribution-specific advisories.
  • Review kernel logs for related block-layer warnings if operationally relevant.
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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ATT&CK lookup starting points

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CVE-2024-26844 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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9124d3fe21b0947b03f4b87bcfb7acd675d6e85b, 9124d3fe21b0947b03f4b87bcfb7acd675d6e85b, 9124d3fe21b0947b03f4b87bcfb7acd675d6e85b, 9124d3fe21b0947b03f4b87bcfb7acd675d6e85bunaffected
LinuxLinux4.0, 0, 6.1.80, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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