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CVE Record

CVE-2022-50666: RDMA/siw: Fix QP destroy to wait for all references dropped.

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: Fix QP destroy to wait for all references dropped. Delay QP destroy completion until all siw references to QP are dropped. The calling RDMA core will free QP structure after successful return from siw_qp_destroy() call, so siw must not hold any remaining reference to the QP upon return. A use-after-free was encountered in xfstest generic/460, while testing NFSoRDMA. Here, after a TCP connection drop by peer, the triggered siw_cm_work_handler got delayed until after QP destroy call, referencing a QP which has already freed.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50666 is a Linux kernel use-after-free flaw in the software RDMA over TCP driver, siw. It was found during NFSoRDMA testing after a peer dropped a TCP connection. Business impact is most relevant to Linux systems using RDMA/siw or NFSoRDMA; general-purpose servers not using this feature are less likely exposed.

Executive priority

Treat as a targeted infrastructure maintenance issue, not an internet-wide emergency based on current evidence. Prioritize environments using RDMA over TCP or NFSoRDMA, especially storage or HPC systems, and fold fixes into the next kernel maintenance window unless vendor guidance raises urgency.

Technical view

The issue is in RDMA/siw queue pair destruction. siw_qp_destroy() could return while siw still held references, allowing RDMA core to free the QP structure before delayed siw_cm_work_handler use. Kernel stable commits change QP destroy behavior to wait until references are dropped. No CVSS or CWE is provided in the source bundle.

Likely exposure

Exposure appears limited to Linux kernels with RDMA/siw enabled and workloads using software RDMA, including NFSoRDMA scenarios. The source lists Linux as affected around versions starting 5.3, with stable fixes referenced for later branches. Validate against vendor kernel advisories because distribution backports may differ.

Exploitation context

The public description cites discovery through xfstest generic/460 while testing NFSoRDMA, triggered after a TCP connection drop by a peer. The source bundle does not show CISA KEV listing, public exploitation, exploit availability, or remote weaponization details.

Researcher notes

Evidence is limited to the CVE text and Linux stable commit references. The bug is a kernel use-after-free caused by asynchronous connection-management work racing with QP teardown. The source does not provide CVSS, affected distribution packages, exploitability analysis, or proof of exploitation.

Mitigation direction

  • Prioritize kernel updates from your Linux distribution or kernel vendor.
  • Verify whether the referenced stable kernel commits are included in deployed kernels.
  • If not needed, consider disabling or avoiding RDMA/siw pending vendor guidance.
  • Track vendor advisories for exact affected and fixed package versions.

Validation and detection

  • Inventory Linux systems using RDMA/siw, Soft-RoCE alternatives, or NFSoRDMA.
  • Check running kernel versions against vendor-fixed builds and stable commit inclusion.
  • Review kernel configuration and loaded modules for siw/RDMA use.
  • Look for crash reports involving siw, QP destruction, or NFSoRDMA connection drops.
Prepared
Confidence
medium
Sources
6

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-2022-50666 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
5Source 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, 303ae1cdfdf7280ff4cfbbe65563b5ff15bb025bunaffected
LinuxLinux5.3, 0, 5.15.75, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

No CWE listed

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