CVE-2026-98248: arm64: percpu: Fix LSE operations on {8,16}-bit types

Published Oct 6, 2026

Updated

arm64: percpu: Fix LSE operations on {8,16}-bit types

Affected Software

1 affected component

Linux Linux kernel

Event History

Oct 6, 2026

CVE Published

via MITRE·08:45 AM

Data Sourced

via MITRE·08:45 AM

Description

Data Sourced

via NVD·09:18 AM

Description

Oct 7, 2026

Data Sourced

via Microsoft·08:09 AM

DescriptionSeverityWeakness

Frequently Asked Questions

Which systems are exposed to the erroneous memory accesses?

The issue affects arm64 Linux kernel environments when LSE instructions are used for 8-bit or 16-bit per-CPU operations. In that condition, the operations can read and write 32-bit memory locations instead of the intended smaller locations.

What is the relevant configuration or execution condition?

The faulty behavior is specific to the LSE instruction path. The LL/SC path is not described as affected, because it uses register-register operations and does not access memory with a size suffix.

How can I check whether the fix is present in kernel source?

Check whether the LSE operation mnemonic is formed by appending the sfx macro argument to op_lse for the affected per-CPU operation macros. The correction should not append sfx to op_llsc.

CVE-2026-98248: arm64: percpu: Fix LSE operations on {8,16}-bit types

Affected Software

Event History

Frequently Asked Questions

Which systems are exposed to the erroneous memory accesses?

What is the relevant configuration or execution condition?

How can I check whether the fix is present in kernel source?

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Frequently Asked Questions

Which systems are exposed to the erroneous memory accesses?

What is the relevant configuration or execution condition?

How can I check whether the fix is present in kernel source?