CVE-2026-53116 (GCVE-0-2026-53116)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
s390/ap: use generic driver_override infrastructure
Summary
In 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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e , < 8f2eca0570438b94602da1297353eb7b10dcb6cb (git)
Affected: d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e , < 81d6f7c3a70b10ff757ee8b5f8114a190871cf1e (git)
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Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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            "drivers/s390/crypto/ap_bus.c",
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          "value": "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()."
        }
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    "datePublished": "2026-06-24T16:30:47.982Z",
    "dateReserved": "2026-06-09T07:44:35.385Z",
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