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CVE Record

CVE-2022-49356: SUNRPC: Trap RDMA segment overflows

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: Trap RDMA segment overflows Prevent svc_rdma_build_writes() from walking off the end of a Write chunk's segment array. Caught with KASAN. The test that this fix replaces is invalid, and might have been left over from an earlier prototype of the PCL work.

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 is a memory-safety bug in the SUNRPC over RDMA code path. A malformed or unexpected RDMA Write chunk could make kernel code read or write past the segment array boundary. The public record does not provide CVSS, impact details, or confirmed exploitation.

Executive priority

Handle through normal kernel vulnerability management, with higher urgency for RDMA-enabled infrastructure. Current evidence does not support emergency exploitation response, but kernel memory-safety bugs can carry operational risk if exposed paths are reachable.

Technical view

The fix prevents svc_rdma_build_writes() from walking off the end of a Write chunk segment array. The kernel description says KASAN caught the issue and that the previous bounds test was invalid. The affected area is SUNRPC/RDMA handling in the Linux kernel.

Likely exposure

Exposure is most relevant to Linux systems using kernel SUNRPC over RDMA server functionality. The source bundle lists Linux kernel affected versions and stable fixes, but it does not provide deployment prerequisites, exploitability, or distribution package mappings.

Exploitation context

No active exploitation is indicated in the source bundle. The CVE is not marked as KEV, and the provided sources only describe the kernel fix. Treat exploitation status as unconfirmed based on available evidence.

Researcher notes

The available record is sparse: no CVSS, CWE, proof-of-concept status, or detailed impact statement. Analysis should focus on the fixed function, affected kernel ranges, distro backports, and whether SUNRPC/RDMA is reachable in the target environment.

Mitigation direction

  • Apply the relevant Linux kernel stable update or distribution vendor kernel update.
  • Prioritize systems using SUNRPC over RDMA or RDMA-enabled storage/network services.
  • Check vendor advisories for distro-specific fixed package versions.
  • If RDMA-based SUNRPC is unnecessary, review whether it can be disabled safely.
  • Track kernel stable commits referenced by the CVE for backport coverage.

Validation and detection

  • Inventory Linux kernel versions across exposed server fleets.
  • Identify hosts using SUNRPC over RDMA or RDMA-capable kernel modules.
  • Compare running kernels with vendor fixed releases and advisories.
  • Confirm updated kernels are booted, not merely installed.
  • Review logs and monitoring for kernel memory errors or crashes.
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

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-2022-49356 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
5Source 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
LinuxLinux7a1cbfa18059a40d4752dab057384c3ca2de326c, 7a1cbfa18059a40d4752dab057384c3ca2de326c, 7a1cbfa18059a40d4752dab057384c3ca2de326c, 7a1cbfa18059a40d4752dab057384c3ca2de326cunaffected
LinuxLinux5.11, 0, 5.15.47, 5.17.15, 5.18.4, 5.19affected
Weakness

CWE details

No CWE listed

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