CVE-2026-72154

Technical Description

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

openrisc: Fix jump_label smp syncing

The original commit 8c30b0018f9d ("openrisc: Add jump label support")

copies from arm64 and does not properly consider how icache invalidation

on remote cores works in OpenRISC. On OpenRISC remote icaches need to

be invalidated otherwise static key's may remain state after updating.

Fix SMP cache syncing by:

1. Properly invalidate remote core icaches on SMP systems by using

icache_all_inv. The old code uses kick_all_cpus_sync() which runs a

no-op IPI function call on remote CPU's which does execute a lot of

code and flushes many cache lines in the process, but does not flush

all and it's not correct on OpenRISC.

2. For architectures that do not have WRITETHROUGH caches be sure

to flush the dcache after patching.

To test this I first reproduced the issue using a custom test module

[0]. The test confirmed that some icache lines maintained stale

static_key

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