{"id":"CVE-2026-53116","title":"s390/ap: use generic driver_override infrastructure","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ap: use generic driver_override infrastructure\n\nWhen the AP masks are updated via apmask_store() or aqmask_store(),\nap_bus_revise_bindings() is called after ap_att…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e < 8f2eca0570438b94602da1297353eb7b10dcb6cb","Linux >= d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e < 81d6f7c3a70b10ff757ee8b5f8114a190871cf1e","Linux 6.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:19:22.073096Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:24:01.522Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53116","references":[{"url":"https://git.kernel.org/stable/c/8f2eca0570438b94602da1297353eb7b10dcb6cb"},{"url":"https://git.kernel.org/stable/c/81d6f7c3a70b10ff757ee8b5f8114a190871cf1e"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.05757,"ingestedAt":"2026-11-06T16:57:43.292Z","slug":"CVE-2026-53116","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ns390/ap: use generic driver_override infrastructure\n\nWhen the AP masks are updated via apmask_store() or aqmask_store(),\nap_bus_revise_bindings() is called after ap_attr_mutex has been\nreleased.\n\nThis calls __ap_revise_reserved(), which accesses the driver_override\nfield without holding any lock, racing against a concurrent\ndriver_override_store() that may free the old string, resulting in a\npotential UAF.\n\nFix this by using the driver-core driver_override infrastructure, which\nprotects all accesses with an internal spinlock.\n\nNote that unlike most other buses, the AP bus does not check\ndriver_override in its match() callback; the override is checked in\nap_device_probe() and __ap_revise_reserved() instead.\n\nAlso note that we do not enable the driver_override feature of struct\nbus_type, as AP - in contrast to most other buses - passes \"\" to\nsysfs_emit() when the driver_override pointer is NULL. Thus, printing\n\"\\n\" instead of \"(null)\\n\".\n\nAdditionally, AP has a custom counter that is modified in the\ncorresponding custom driver_override_store().\n\n## Affected\n\n- `Linux >= d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e < 8f2eca0570438b94602da1297353eb7b10dcb6cb`\n- `Linux >= d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e < 81d6f7c3a70b10ff757ee8b5f8114a190871cf1e`\n- `Linux 6.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}