CVE-2026-93114

Summary

In the Linux kernel, the following vulnerability has been resolved:

platform/surface: acpi-notify: Check ACPI companion before use

Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence.

san_probe() dereferences the result of ACPI_COMPANION() when installing the GSBUS address space handler, so force-binding the driver to a device without an ACPI companion leads to a NULL pointer dereference. The dereference was introduced when the probe function was switched from ACPI_HANDLE() to ACPI_COMPANION().

Check the ACPI companion against NULL and return -ENODEV when it is missing, like commit e4865a56d013 ("ACPI: driver: Check ACPI_COMPANION() against NULL during probe") does for the core ACPI platform drivers.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 4faa43d4ef0b98beb6c2b77a279f4aa5d7fa2d13affected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 3855be0100efb98c26228c610db70a673611f3bdaffected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < f276b62f2ce1cbff7fa50a8ee5afd8fef5a60897affected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 9b6479da662c2ec4e931ed9f7228df46aa8c3766affected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 7fea5a310e3b2db24f7aafe64897e4e659ffbb7daffected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 428a82d987fcd8844e8868c85582eae75b4b5c51affected
LinuxLinuxa9e10e58730432e5de840eb3ddd55c75f29341b3 < 2b3a5dabe89e330413af403246b648c1890f368faffected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References