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CVE Record

CVE-2024-40967: serial: imx: Introduce timeout when waiting on transmitter empty

In the Linux kernel, the following vulnerability has been resolved: serial: imx: Introduce timeout when waiting on transmitter empty By waiting at most 1 second for USR2_TXDC to be set, we avoid a potential deadlock. In case of the timeout, there is not much we can do, so we simply ignore the transmitter state and optimistically try to continue.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-40967 is a Linux kernel issue in the i.MX serial driver where waiting forever for transmitter-empty status could deadlock the system path. The fix adds a one-second timeout and continues if the hardware state does not clear. Business impact is mainly availability risk on affected Linux systems using this driver.

Executive priority

Handle through normal kernel patch management, with higher priority for embedded, edge, or operational systems that depend on i.MX serial hardware. Current evidence does not justify emergency response based on exploitation, but deadlock risk can still affect service availability.

Technical view

The kernel serial/imx code waited indefinitely for USR2_TXDC. The resolved change bounds that wait to one second, avoiding a potential deadlock when transmitter completion never appears. Sources provide kernel stable commits and a Debian LTS announcement, but no CVSS, CWE, or detailed exploit conditions.

Likely exposure

Exposure is most plausible on Linux deployments that include and use the i.MX serial driver, commonly embedded or hardware-specific Linux builds. The provided CVE data lists Linux kernel versions and stable commits but does not provide CPEs, CVSS, or a complete product matrix.

Exploitation context

The source bundle does not show CISA KEV listing or any cited active exploitation report. Treat this as a reliability and availability vulnerability until vendor advisories or asset-specific evidence indicate higher urgency.

Researcher notes

Evidence is limited to the CVE description, kernel stable commits, and Debian LTS reference. The root issue is an unbounded wait on USR2_TXDC in serial/imx. The fix strategy is timeout-based, not a broader redesign. No exploit prerequisites or attack surface details are provided.

Mitigation direction

  • Update affected Linux kernels using vendor or distribution packages containing the referenced stable fixes.
  • For Debian LTS systems, review and apply the cited Debian LTS kernel guidance.
  • Prioritize systems using i.MX serial hardware or serial console paths.
  • If patching is delayed, monitor affected devices for serial-driver hangs or unexplained deadlocks.

Validation and detection

  • Inventory kernel versions and package sources across Linux assets.
  • Confirm whether the imx serial driver is built, loaded, or required on each system.
  • Compare running kernels against vendor advisories and referenced stable kernel commits.
  • Check distribution security trackers for fixed package versions before closure.
  • Review operational logs for serial-console stalls or related kernel hangs.
Prepared
Confidence
medium
Sources
8

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2024-40967 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
7Source 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
LinuxLinux9ec1882df244c4ee1baa692676fef5e8b0f5487d, 9ec1882df244c4ee1baa692676fef5e8b0f5487d, 9ec1882df244c4ee1baa692676fef5e8b0f5487d, 9ec1882df244c4ee1baa692676fef5e8b0f5487d, 9ec1882df244c4ee1baa692676fef5e8b0f5487d, c096552004244868391b29f319ea8889d55abe19, 86236252d2449313bdbac790023cbc957bf6e426, 34d4dda865d8174f4a437f313c457c42a8fa9535, 3.2.30, 3.4.12, 3.5.5unaffected
LinuxLinux3.6, 0, 5.15.162, 6.1.96, 6.6.36, 6.9.7, 6.10affected
Weakness

CWE details

No CWE listed

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