CVE-2022-49321

NFS client crash via misclassified RDMA reply

Published Feb 26, 2025 · Updated Aug 5, 2026

NULL pointer dereference in affected Linux kernel releases allows attackers controlling an RDMA server to crash an NFSv3 client. rpc_rdma.c classifies a fault-format RPC reply as a backchannel call even when bc_serv is NULL, then rpcrdma_bc_receive_call dereferences the missing service. Exploitation requires an NFSv3-over-RDMA client to process the server reply, and the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in affected Linux kernel releases allows attackers controlling an RDMA server to crash an NFSv3 client. rpc_rdma.c classifies a fault-format RPC reply as a backchannel call even when bc_serv is NULL, then rpcrdma_bc_receive_call dereferences the missing service. Exploitation requires an NFSv3-over-RDMA client to process the server reply, and the documented consequence is a kernel crash.

The record

CVE
CVE-2022-49321
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.4
  2. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <11270e7ca268e8d61b5d9e5c3a54bd1550642c9c
  3. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <8dbae5affbdbf524b48000f9d357925bb001e5f4
  4. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <8e3943c50764dc7c5f25911970c3ff062ec1f18c
  5. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <90c4f73104016748533a5707ecd15930fbeff402
  6. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <91784f3d77b73885e1b2e6b59d3cbf0de0a1126a
  7. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <998d35a2aff4b81a1c784f3aa45cd3afff6814c1
  8. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <a3fc8051ee061e31db13e2fe011e8e0b71a7f815
  9. Affected versionversion=63cae47005af51c937f4cdcc4835f29075add2ba <da99331fa62131a38a0947a8204c5208de7b0454

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=63cae47005af51c937f4cdcc4835f29075add2ba <11270e7ca268e8d61b5d9e5c3a54bd1550642c9c; version=63cae47005af51c937f4cdcc4835f29075add2ba <8dbae5affbdbf524b48000f9d357925bb001e5f4; version=63cae47005af51c937f4cdcc4835f29075add2ba <8e3943c50764dc7c5f25911970c3ff062ec1f18c; version=63cae47005af51c937f4cdcc4835f29075add2ba <90c4f73104016748533a5707ecd15930fbeff402; version=63cae47005af51c937f4cdcc4835f29075add2ba <91784f3d77b73885e1b2e6b59d3cbf0de0a1126a; version=63cae47005af51c937f4cdcc4835f29075add2ba <998d35a2aff4b81a1c784f3aa45cd3afff6814c1; version=63cae47005af51c937f4cdcc4835f29075add2ba <a3fc8051ee061e31db13e2fe011e8e0b71a7f815; version=63cae47005af51c937f4cdcc4835f29075add2ba <da99331fa62131a38a0947a8204c5208de7b0454

Published CVSS scores

5.5CISA ADP VulnrichmentCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo