{"id":"CVE-2026-53116","summary":"s390/ap: use generic driver_override infrastructure","details":"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_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().","modified":"2026-06-26T12:06:23.548459978Z","published":"2026-06-24T16:30:47.982Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53116.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/81d6f7c3a70b10ff757ee8b5f8114a190871cf1e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8f2eca0570438b94602da1297353eb7b10dcb6cb"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53116.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53116"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e"},{"fixed":"8f2eca0570438b94602da1297353eb7b10dcb6cb"},{"fixed":"81d6f7c3a70b10ff757ee8b5f8114a190871cf1e"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53116.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53116.json"}}],"schema_version":"1.7.5"}