CVE-2026-89903 Linux kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability in LoongArch rethook trampoline caused by saving and restoring percpu base register across CPU migrations, letting attackers cause scheduler and timer corruption under heavy kretprobe load, exploit requires kretprobe usage on LoongArch.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for the LoongArch rethook trampoline issue.

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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