CVE-2026-89588: Linux

High severity, CVSS 8.4. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ACPI: APEI: GHES: fix ARM section length accounting after header In ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm header with (err + 1), the remaining length was reduced by sizeof(err) (pointer size) instead of sizeof(*err) (structure size). That overestimates the bytes left for cper_arm_err_info records and can let the parser read past the CPER section when err_info_num is large enough relative to error_data_length. Use sizeof(*err) so the length accounting matches the pointer advance and the earlier sizeof(*err) size check.

Affected products

• Linux Linux: from 6.12.75, before 6.12.109 (fixed in 6.12.109); from 6.18.16, before 6.18.50 (fixed in 6.18.50); from 6.19.6, before 6.20 (fixed in 6.20); from 7.0, before 7.2.4 (fixed in 7.2.4)

Published 2026-09-11. Last modified 2026-09-13.