CVE-2022-49356Network attack vector

Host crash via unchecked RDMA segment index

Published Feb 26, 2025 · Updated Aug 5, 2026

Out-of-bounds access in the Linux kernel SUNRPC RDMA server allows remote attackers to crash the host via crafted RPC-over-RDMA calls. svc_rdma_build_writes() dereferences a client-controlled Write-chunk segment index before verifying it is below ch_segcount, walking beyond ch_segments. The path is reachable before authentication only when NFS/RDMA server support is enabled and listening over an RDMA transport.

CVSS severity5.5
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel SUNRPC RDMA server allows remote attackers to crash the host via crafted RPC-over-RDMA calls. svc_rdma_build_writes() dereferences a client-controlled Write-chunk segment index before verifying it is below ch_segcount, walking beyond ch_segments. The path is reachable before authentication only when NFS/RDMA server support is enabled and listening over an RDMA transport.

The record

CVE
CVE-2022-49356
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.11
  2. Affected versionversion=7a1cbfa18059a40d4752dab057384c3ca2de326c <659f7568e09593945c221bf20217a82ebdfe1328
  3. Affected versionversion=7a1cbfa18059a40d4752dab057384c3ca2de326c <812c13521d4a72469c78ce06d8cdc8dc5b5557b5
  4. Affected versionversion=7a1cbfa18059a40d4752dab057384c3ca2de326c <ea26bf5eca1459b5a7824997d7823409ce38214e
  5. Affected versionversion=7a1cbfa18059a40d4752dab057384c3ca2de326c <f012e95b377c73c0283f009823c633104dedb337

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=7a1cbfa18059a40d4752dab057384c3ca2de326c <659f7568e09593945c221bf20217a82ebdfe1328; version=7a1cbfa18059a40d4752dab057384c3ca2de326c <812c13521d4a72469c78ce06d8cdc8dc5b5557b5; version=7a1cbfa18059a40d4752dab057384c3ca2de326c <ea26bf5eca1459b5a7824997d7823409ce38214e; version=7a1cbfa18059a40d4752dab057384c3ca2de326c <f012e95b377c73c0283f009823c633104dedb337

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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