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CVE Record

CVE-2024-38556: net/mlx5: Add a timeout to acquire the command queue semaphore

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Add a timeout to acquire the command queue semaphore Prevent forced completion handling on an entry that has not yet been assigned an index, causing an out of bounds access on idx = -22. Instead of waiting indefinitely for the sem, blocking flow now waits for index to be allocated or a sem acquisition timeout before beginning the timer for FW completion. Kernel log example: mlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No done completion

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 the mlx5 network driver’s command handling. A command path could wait incorrectly and then process a forced completion before a queue index exists, causing an out-of-bounds access. The public data does not provide CVSS, business impact, or confirmed exploitation evidence.

Executive priority

Track this through normal vulnerability management, with faster action for critical Linux servers using mlx5 networking. There is no cited evidence of active exploitation, but kernel out-of-bounds access warrants timely patch planning.

Technical view

The fix adds timeout-aware semaphore acquisition in net/mlx5 command queue handling. The resolved bug involved forced completion on an entry without an assigned index, producing idx = -22 and an out-of-bounds access during firmware command completion handling.

Likely exposure

Likely limited to Linux systems running affected kernels with the mlx5 driver in use. The bundle lists Linux affected versions including 5.17, 6.1.93, 6.6.33, 6.8.12, 6.9.3, and 6.10, but product and environment exposure details are incomplete.

Exploitation context

No source in the bundle states active exploitation, public exploit availability, or inclusion in CISA KEV. Treat this as a kernel stability and memory-safety issue until vendor advisories provide stronger impact details.

Researcher notes

Evidence is limited to the Linux CVE text and stable commit references. The bundle does not include CVSS, CWE, exploitability analysis, or distribution-specific package status, so validation should focus on kernel version, driver use, and vendor backports.

Mitigation direction

  • Update affected Linux kernels to a release containing the referenced stable fixes.
  • Prioritize systems using the mlx5 driver in production or multi-tenant environments.
  • Check distribution vendor advisories for packaged kernel fix availability.
  • Avoid direct wrangler or deployment assumptions; follow normal kernel maintenance process.

Validation and detection

  • Inventory Linux hosts and identify kernels using the mlx5 driver.
  • Compare installed kernel packages against vendor advisories for CVE-2024-38556.
  • Review kernel logs for mlx5_core command timeout messages similar to the cited example.
  • Confirm the deployed kernel includes one of the referenced stable commits.
Prepared
Confidence
medium
Sources
7

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-2024-38556 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
6Source 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
LinuxLinux8e715cd613a1e872b9d918e912d90b399785761a, 8e715cd613a1e872b9d918e912d90b399785761a, 8e715cd613a1e872b9d918e912d90b399785761a, 8e715cd613a1e872b9d918e912d90b399785761a, 8e715cd613a1e872b9d918e912d90b399785761a, 74dd45122b84479eee50bd0956ae8bc5799c9f8a, e801f81cee3c8901f52ee48c6329802b28fbb49c, d73d81447c6651904dd4a9e3fd88651ff174c1b7, 4646175c19fd019b773444a11ff62748eb83745bunaffected
LinuxLinux5.17, 0, 6.1.93, 6.6.33, 6.8.12, 6.9.3, 6.10affected
Weakness

CWE details

No CWE listed

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