CVE-2026-89532Network attack vector

Remote crash via zero-segment RDMA chunk

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in Linux svcrdma allows remote attackers to crash an RPC-over-RDMA server using a zero-segment Write or Reply chunk. pcl_for_each_segment subtracts one from unsigned ch_segcount to form an inclusive array bound, so zero wraps to 0xFFFFFFFF and svc_rdma_get_inv_rkey walks unrelated memory. The path is reachable after Send-With-Invalidate negotiation, and dereferencing rs_handle causes a general protection fault rather than data disclosure.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
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

Out-of-bounds read in Linux svcrdma allows remote attackers to crash an RPC-over-RDMA server using a zero-segment Write or Reply chunk. pcl_for_each_segment subtracts one from unsigned ch_segcount to form an inclusive array bound, so zero wraps to 0xFFFFFFFF and svc_rdma_get_inv_rkey walks unrelated memory. The path is reachable after Send-With-Invalidate negotiation, and dereferencing rs_handle causes a general protection fault rather than data disclosure.

The record

CVE
CVE-2026-89532
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=5.11
  2. Affected versionversion=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <6d33a7e6bf6c6b293a266a617201285a1ad32c56
  3. Affected versionversion=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <9c5a03c3dc505c0295339b0a1b9e4fe36447e482
  4. Affected versionversion=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8
  5. Affected versionversion=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <b7713a784c59515d0aba558c8f5df6a0164dd3a9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <6d33a7e6bf6c6b293a266a617201285a1ad32c56; version=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <9c5a03c3dc505c0295339b0a1b9e4fe36447e482; version=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <a1c954ca4977a4e6ec73ef92fe48073ec54f9fc8; version=78147ca8b4a9b6cf0e597ddd6bf17959e08376c2 <b7713a784c59515d0aba558c8f5df6a0164dd3a9

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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