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CVE Record

CVE-2024-27069: ovl: relax WARN_ON in ovl_verify_area()

In the Linux kernel, the following vulnerability has been resolved: ovl: relax WARN_ON in ovl_verify_area() syzbot hit an assertion in copy up data loop which looks like it is the result of a lower file whose size is being changed underneath overlayfs. This type of use case is documented to cause undefined behavior, so returning EIO error for the copy up makes sense, but it should not be causing a WARN_ON assertion.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects overlayfs error handling. A documented undefined file-change case could trigger a kernel warning assertion instead of returning an I/O error. The sources do not show data theft, privilege escalation, or active exploitation, but affected kernels should still receive normal vendor kernel updates.

Executive priority

Treat this as routine kernel hygiene unless vendor guidance raises severity. Patch affected overlayfs-capable Linux hosts through normal maintenance, with earlier attention for container infrastructure where overlayfs is heavily used.

Technical view

The fix changes ovl_verify_area() behavior during overlayfs copy-up when the lower file size changes underneath it. syzbot found a WARN_ON assertion in that path. The resolved behavior is to return EIO for the undefined condition rather than raise the assertion. Public metadata lists Linux kernel 6.8-related affected versions and two stable commits.

Likely exposure

Exposure is most plausible on Linux systems running affected 6.8-series kernel builds that use overlayfs, commonly through container or layered filesystem workloads. The bundle does not define affected distributions, package versions, or cloud images.

Exploitation context

The provided sources cite syzbot discovery and a kernel logic fix. There is no KEV listing and no cited evidence of active exploitation, public weaponization, or a complete impact chain beyond the warning assertion behavior.

Researcher notes

Evidence is limited to the CVE description and Linux stable commit references. No CVSS, CWE, exploit status, or distribution-specific fixed versions are provided in the bundle. The practical impact appears tied to assertion behavior during an undefined overlayfs lower-file mutation case.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable overlayfs fixes.
  • Prioritize systems using overlayfs or container storage on affected kernels.
  • Check distribution advisories for exact fixed package versions.
  • Avoid changing lower-layer files underneath active overlayfs mounts where operationally possible.

Validation and detection

  • Inventory Linux kernel versions across servers, containers hosts, and appliances.
  • Identify systems using overlayfs or container layered storage.
  • Compare deployed kernel builds against vendor advisories and referenced stable commits.
  • Review kernel logs for overlayfs WARN_ON or EIO events around copy-up activity.
Prepared
Confidence
medium
Sources
4

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-2024-27069 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
3Source 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
LinuxLinuxca7ab482401cf0a7497dad05f4918dc64115538b, ca7ab482401cf0a7497dad05f4918dc64115538bunaffected
LinuxLinux6.8, 0, 6.8.2, 6.9affected
Weakness

CWE details

No CWE listed

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