openrisc: Fix jump_label smp syncing

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Summary

CVECVE-2026-72154
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:33 UTC
Updated2026-08-15 06:21:33 UTC
DescriptionIn 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 code sequences after calling static_branch_enable(). After this patch there are no longer jump_label coherency issues. [0] https://github.com/stffrdhrn/or1k-utils/tree/master/tests/smp_static_key_test

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.109950000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8c30b0018f9d93391573e091960d257fd9de120a 3fac46068fe4cea22ed373432b9173a915e8e60d git Not specified
CNA Linux Linux affected 8c30b0018f9d93391573e091960d257fd9de120a 57740658042daf591c57d6e700d9a304d5972552 git Not specified
CNA Linux Linux affected 8c30b0018f9d93391573e091960d257fd9de120a aca063c9024522e4e5b9a9d1927433f6a01785a3 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3fac46068fe4cea22ed373432b9173a915e8e60d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aca063c9024522e4e5b9a9d1927433f6a01785a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57740658042daf591c57d6e700d9a304d5972552 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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