CVE-2026-89489 Linux Kernel - Broken Access Control

Linux kernel openrisc ABI < 244 contains an arbitrary kernel memory access vulnerability caused by unchecked user pointers in sys_or1k_atomic syscall, letting unprivileged attackers read/write kernel memory and execute code, exploit requires unprivileged process.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Remote Code Execution, Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to a Linux kernel version with the sys_or1k_atomic pointer validation fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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