CVE-2026-98248

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

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

The assembly for __percpu_##name##_case_##sz() and

__percpu_##name##_return_case_##sz() doesn't use the 'sfx' macro

argument to form the LSE instruction. Without 'sfx', a W register

argument will imply a 32-bit memory location, and consequently

{8,16}-bit ops will erroneously read and write 32 bits of memory when

the LSE instruction is used.

Fix this by appending 'sfx' to 'op_lse' to LSE instruction. It is not

necessary (and not valid) to append 'sfx' to 'op_llsc', as 'op_llsc' is

a register-register operation which does not access memory (and does not

take a size suffix).

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References