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CVE Record

CVE-2026-23289: IB/mthca: Add missed mthca_unmap_user_db() for mthca_create_srq()

In the Linux kernel, the following vulnerability has been resolved: IB/mthca: Add missed mthca_unmap_user_db() for mthca_create_srq() Fix a user triggerable leak on the system call failure path.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2026-23289 is a Linux kernel issue in the IB/mthca InfiniBand driver. A user-triggerable failure path can leak a mapped user doorbell resource. The public record does not provide CVSS, CWE, impact detail, or evidence of exploitation, so urgency depends on whether exposed Linux systems use this driver and feature path.

Executive priority

Treat as a targeted kernel maintenance item, not a broad emergency based on current evidence. Prioritize high-value or multi-user Linux systems using affected InfiniBand functionality, and fold remediation into the next approved kernel update cycle unless vendor guidance escalates severity.

Technical view

The fix adds a missed mthca_unmap_user_db() call in mthca_create_srq() on a system call failure path. The issue is described as a user-triggerable leak. Stable kernel commit references are provided, but the bundle does not describe privilege requirements, leak impact, denial-of-service potential, or exploitability.

Likely exposure

Most relevant to Linux hosts running affected kernel builds with IB/mthca support in use. Exposure is likely narrower than general Linux fleet exposure, but the source bundle does not identify distributions, configurations, or package versions.

Exploitation context

No active exploitation is supported by the provided sources, and KEV status is false. The record says the bug is user-triggerable, implying local interaction with the affected kernel path, but exploitation conditions are not fully documented.

Researcher notes

The public bundle is sparse: no CVSS, CWE, reproducer, detailed impact, or exploit report is provided. Analysis should stay close to the kernel fix: a missing cleanup call in mthca_create_srq() causing a user-triggerable resource leak on error handling.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the listed stable fixes.
  • Prioritize Linux systems using IB/mthca or related InfiniBand/RDMA functionality.
  • If updates are unavailable, follow vendor guidance for temporary risk reduction.
  • Track downstream advisories for package-specific fixed versions.

Validation and detection

  • Inventory Linux kernel versions across systems with InfiniBand or RDMA hardware.
  • Check whether IB/mthca support is present or loaded on those systems.
  • Compare kernel source or packages against the listed stable commit fixes.
  • Confirm vendor advisories mark the installed kernel build as fixed.
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

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-2026-23289 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
LinuxLinuxec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfe, ec34a922d243c3401a694450734e9effb2bafbfeunaffected
LinuxLinux2.6.14, 0, 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7, 7.0affected
Weakness

CWE details

No CWE listed

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