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CVE Record

CVE-2022-50736: RDMA/siw: Fix immediate work request flush to completion queue

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix immediate work request flush to completion queue Correctly set send queue element opcode during immediate work request flushing in post sendqueue operation, if the QP is in ERROR state. An undefined ocode value results in out-of-bounds access to an array for mapping the opcode between siw internal and RDMA core representation in work completion generation. It resulted in a KASAN BUG report of type 'global-out-of-bounds' during NFSoRDMA testing. This patch further fixes a potential case of a malicious user which may write undefined values for completion queue elements status or opcode, if the CQ is memory mapped to user land. It avoids the same out-of-bounds access to arrays for status and opcode mapping as described above.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50736 is a Linux kernel RDMA Soft-iWARP bug. Under error handling, an undefined operation code can cause out-of-bounds array access while generating completions. The public record ties this to KASAN findings during NFSoRDMA testing and notes a possible malicious user case when completion queues are mapped to user space.

Executive priority

Treat as a targeted kernel maintenance issue. Prioritize systems using RDMA/siw, storage over RDMA, or multi-user environments with RDMA access. For ordinary servers without RDMA use, handle through normal kernel update cycles unless vendor guidance raises severity.

Technical view

The issue is in RDMA/siw immediate work request flushing when a queue pair is in ERROR state. Incorrect or undefined opcode/status values may be used in mapping arrays between siw and RDMA core completion representations, causing global out-of-bounds access. Kernel stable commits correct opcode handling and guard mapping behavior.

Likely exposure

Exposure is most relevant to Linux systems with RDMA/siw or NFSoRDMA-related workloads enabled or available to users. General Linux hosts not using RDMA/siw are less likely to be exposed, but kernel package provenance should be checked.

Exploitation context

No active exploitation is indicated in the provided sources, and the CVE is not marked KEV. The record mentions a potential malicious user scenario involving user-mapped completion queues, but provides no public exploit details or CVSS score.

Researcher notes

The public record lacks CVSS, CWE, and detailed affected-version boundaries. The strongest evidence is the Linux kernel description and stable commit references. Analysis should focus on RDMA/siw code paths, queue pair ERROR handling, and completion queue mmap exposure.

Mitigation direction

  • Identify Linux kernels with RDMA/siw support in scope.
  • Update to a vendor kernel containing the referenced stable fixes.
  • If patch timing is unclear, follow your Linux distributor guidance.
  • Reduce unnecessary RDMA/siw exposure where operationally feasible.

Validation and detection

  • Inventory kernel versions and enabled RDMA modules.
  • Check whether siw or NFSoRDMA is used in production.
  • Confirm vendor advisories or kernel changelogs include the cited commits.
  • Review kernel logs for related KASAN or RDMA completion errors.
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

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CVE-2022-50736 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
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux303ae1cdfdf7280ff4cfbbe65563b5ff15bb025b, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025b, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025b, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025b, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025b, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025bunaffected
LinuxLinux5.3, 0, 5.4.229, 5.10.163, 5.15.86, 6.0.16, 6.1.2, 6.2affected
Weakness

CWE details

No CWE listed

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