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CVE Record

CVE-2023-54244: ACPI: EC: Fix oops when removing custom query handlers

In the Linux kernel, the following vulnerability has been resolved: ACPI: EC: Fix oops when removing custom query handlers When removing custom query handlers, the handler might still be used inside the EC query workqueue, causing a kernel oops if the module holding the callback function was already unloaded. Fix this by flushing the EC query workqueue when removing custom query handlers. Tested on a Acer Travelmate 4002WLMi

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-54244 is a Linux kernel reliability flaw in ACPI Embedded Controller handling. Under a narrow timing condition, removing a custom query handler while queued EC work still references it can cause a kernel oops after the callback module is unloaded.

Executive priority

Treat as routine-to-targeted kernel maintenance unless your fleet depends on custom ACPI EC modules. The business risk is mainly availability disruption on affected Linux hosts, with incomplete public severity data.

Technical view

The flaw is a use-after-unload style race in ACPI EC custom query handler removal. The documented fix flushes the EC query workqueue when handlers are removed, preventing queued work from calling a callback held by an unloaded module.

Likely exposure

Exposure appears limited to Linux systems using ACPI EC custom query handlers, especially where related kernel modules can be unloaded. The source lists Linux kernel versions from 2.6.33 through several stable branches as affected, with fixes referenced in kernel stable commits.

Exploitation context

The source bundle does not show active exploitation, public exploit availability, CVSS scoring, CWE mapping, or KEV listing. Evidence supports a potential local kernel oops condition, not remote compromise or privilege escalation.

Researcher notes

The core issue is stale queued EC work retaining a callback after handler removal and module unload. The patch direction is explicit: flush the EC query workqueue during removal. Source evidence is narrow and does not establish exploitability beyond kernel oops.

Mitigation direction

  • Apply a vendor-supported Linux kernel update containing the referenced stable fixes.
  • Prioritize systems that load or unload ACPI EC custom query-handler modules.
  • Check Linux distribution advisories for exact fixed package versions.
  • Avoid unnecessary unloading of affected ACPI EC-related modules until patched.

Validation and detection

  • Inventory Linux kernel versions across affected endpoint and server fleets.
  • Confirm whether systems use ACPI EC custom query handlers or related modules.
  • Verify installed kernels include one of the referenced stable fixes or downstream backports.
  • Review kernel logs for ACPI EC oops events during module removal.
Prepared
Confidence
medium
Sources
10

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-2023-54244 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
0ADP providers
9Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxa62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, a62e8f1978f49e52f87a711ff6711b323d4b12ff, 1ff7b99e4983d9e93d25e98ba1ce303ad4e4909e, 2.6.32.6unaffected
LinuxLinux2.6.33, 0, 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4, 6.4affected
Weakness

CWE details

No CWE listed

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