CVE-2026-89489

Kernel code execution via unchecked atomic pointers

Published Sep 11, 2026 · Updated Sep 11, 2026

Improper address validation in the Linux kernel allows local users on OpenRISC systems to execute code in kernel context. The sys_or1k_atomic syscall swaps words through two caller-supplied pointers without access_ok() checks or exception-table fixups. An unprivileged process can supply a kernel address to read and write kernel memory directly and overwrite data such as sys_call_table.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper address validation in the Linux kernel allows local users on OpenRISC systems to execute code in kernel context. The sys_or1k_atomic syscall swaps words through two caller-supplied pointers without access_ok() checks or exception-table fixups. An unprivileged process can supply a kernel address to read and write kernel memory directly and overwrite data such as sys_call_table.

The record

CVE
CVE-2026-89489
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

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=3.1
  2. Affected versionversion=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <78004e9a87f240df03e2f73120d291763c32e0a7
  3. Affected versionversion=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <a520e8cac54fb403f3800125b606f55fcad42cb9
  4. Affected versionversion=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <b53435c079c78f89f70a62dd5a322cca4e292b34
  5. Affected versionversion=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <d64a75369cd0f2ee79afcc9d9ca34a3890989379

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <78004e9a87f240df03e2f73120d291763c32e0a7; version=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <a520e8cac54fb403f3800125b606f55fcad42cb9; version=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <b53435c079c78f89f70a62dd5a322cca4e292b34; version=9d02a4283e9ce4e9ca11ff00615bdacdb0515a1a <d64a75369cd0f2ee79afcc9d9ca34a3890989379

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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