CVE-2026-89588 Linux Kernel - Out of Bounds Read

Linux kernel contains a buffer over-read caused by incorrect ARM section length accounting in ghes_handle_arm_hw_error(), letting attackers potentially read beyond CPER section, exploit requires crafted error data.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out of Bounds Read
Impact
Information Disclosure, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for ACPI APEI GHES ARM section length accounting.

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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