CVE-2026-89798

Kernel fault via unarmed rpcrdma callback

Published Sep 16, 2026 · Updated Sep 16, 2026

A race condition in Linux 6.11 rpcrdma notifications allows attackers to trigger a kernel NULL-pointer fault via a device-removal race. rpcrdma_rn_register() publishes a notification in rd_xa before assigning rn_done, letting rpcrdma_remove_one() observe the object and call an uninitialized callback. Exploitation requires device removal to overlap a fresh RPC-over-RDMA notification registration; the documented consequence is the NULL callback fault.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux 6.11 rpcrdma notifications allows attackers to trigger a kernel NULL-pointer fault via a device-removal race. rpcrdma_rn_register() publishes a notification in rd_xa before assigning rn_done, letting rpcrdma_remove_one() observe the object and call an uninitialized callback. Exploitation requires device removal to overlap a fresh RPC-over-RDMA notification registration; the documented consequence is the NULL callback fault.

The record

CVE
CVE-2026-89798
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=6.11
  2. Affected versionversion=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <3c97b8e76ca2bba9e8770571413aed694068e78e
  3. Affected versionversion=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <5b06f706374c37375bdff9d21cc10e61df925a92
  4. Affected versionversion=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <ea0408273ccf5df1fb52d9a1b9db4d31600dcb36

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <3c97b8e76ca2bba9e8770571413aed694068e78e; version=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <5b06f706374c37375bdff9d21cc10e61df925a92; version=7e86845a0346efc95fddaa97ce5cd6a8bda8c71c <ea0408273ccf5df1fb52d9a1b9db4d31600dcb36

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

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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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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