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CVE Record

CVE-2024-38545: RDMA/hns: Fix UAF for cq async event

In the Linux kernel, the following vulnerability has been resolved: RDMA/hns: Fix UAF for cq async event The refcount of CQ is not protected by locks. When CQ asynchronous events and CQ destruction are concurrent, CQ may have been released, which will cause UAF. Use the xa_lock() to protect the CQ refcount.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-38545 is a Linux kernel use-after-free issue in the HNS RDMA driver. A timing race between an asynchronous completion queue event and queue destruction can cause the kernel to use memory after it was released. The sources do not provide CVSS, impact, or attacker-prerequisite details.

Executive priority

Medium operational priority where HNS RDMA is present; lower priority for fleets without that driver path. Because severity and exploitation details are missing, handle through kernel patch governance rather than emergency response unless vendor guidance elevates urgency.

Technical view

The bug is in RDMA/hns completion queue handling. The CQ refcount was not lock-protected; concurrent CQ asynchronous events and CQ teardown could release the CQ before event handling finished, causing UAF. The kernel fix protects the CQ refcount with xa_lock().

Likely exposure

Exposure appears limited to Linux systems using the HNS RDMA driver path, commonly tied to HiSilicon RDMA-capable environments. General Linux systems without that driver or hardware path are less likely to be exposed. Version data in the bundle identifies Linux kernel branches and stable commits but not distro package mappings.

Exploitation context

The bundle states KEV is false and provides no evidence of active exploitation. It also does not describe a public exploit, remote reachability, privileges required, or reliable impact. Treat exploitation assumptions as unknown until vendor or distro advisories add detail.

Researcher notes

The public record is sparse: no CVSS, CWE, impact statement, or attacker model is provided. The key evidence is the kernel commit rationale: a race on CQ refcount during async event handling and destruction, fixed by locking. Avoid assuming exploitability beyond the documented UAF condition.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable fixes.
  • Prioritize Linux hosts using HNS RDMA hardware or the RDMA/hns driver.
  • Map running distro kernels to vendor advisories for CVE-2024-38545.
  • If updates are unavailable, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory hosts with RDMA support and HNS driver usage.
  • Check running kernel versions against distro CVE-2024-38545 advisories.
  • Confirm the kernel includes the RDMA/hns CQ refcount locking fix.
  • Review change records to ensure patched kernels are deployed and booted.
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.

ATT&CK lookup starting points

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CVE-2024-38545 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
LinuxLinux9a4435375cd151e07c0c38fa601b00115986091b, 9a4435375cd151e07c0c38fa601b00115986091b, 9a4435375cd151e07c0c38fa601b00115986091b, 9a4435375cd151e07c0c38fa601b00115986091b, 9a4435375cd151e07c0c38fa601b00115986091b, 9a4435375cd151e07c0c38fa601b00115986091bunaffected
LinuxLinux4.9, 0, 5.15.168, 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.