s390/ap: use generic driver_override infrastructure

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Summary

CVECVE-2026-53116
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:25 UTC
Updated2026-06-24 17:17:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: s390/ap: use generic driver_override infrastructure When the AP masks are updated via apmask_store() or aqmask_store(), ap_bus_revise_bindings() is called after ap_attr_mutex has been released. This calls __ap_revise_reserved(), which accesses the driver_override field without holding any lock, racing against a concurrent driver_override_store() that may free the old string, resulting in a potential UAF. Fix this by using the driver-core driver_override infrastructure, which protects all accesses with an internal spinlock. Note that unlike most other buses, the AP bus does not check driver_override in its match() callback; the override is checked in ap_device_probe() and __ap_revise_reserved() instead. Also note that we do not enable the driver_override feature of struct bus_type, as AP - in contrast to most other buses - passes "" to sysfs_emit() when the driver_override pointer is NULL. Thus, printing "\n" instead of "(null)\n". Additionally, AP has a custom counter that is modified in the corresponding custom driver_override_store().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e 8f2eca0570438b94602da1297353eb7b10dcb6cb git Not specified
CNA Linux Linux affected d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e 81d6f7c3a70b10ff757ee8b5f8114a190871cf1e git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/81d6f7c3a70b10ff757ee8b5f8114a190871cf1e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8f2eca0570438b94602da1297353eb7b10dcb6cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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