CVE-2026-93068

Summary

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

drm/amd/display: Fix DM I2C teardown race

DM I2C adapters can remain visible to userspace while DM teardown is already in progress. A concurrent i2c-dev transfer may then enter amdgpu_dm_i2c_xfer() after the backing DM state has been torn down, leading to a NULL pointer dereference.

Create a devres group around the DM I2C adapter lifetime and release it at the start of dm_hw_fini(), before HPD, IRQ, and DM state are torn down. This removes the I2C adapters first and waits for in-flight users to drain before the structures used by amdgpu_dm_i2c_xfer() disappear.

This fixes a teardown ordering race seen during device removal:

BUG: kernel NULL pointer dereference RIP: amdgpu_dm_i2c_xfer+0x122/0x1c0 [amdgpu] Call Trace: __i2c_transfer i2c_transfer i2cdev_ioctl_rdwr

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 < 8ee385305e8902fa6fbfd66b5a112238292567b6affected
LinuxLinux5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 < 6970ec944567f109ac4240f9aea58158ee8a18cdaffected
LinuxLinux5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 < e4ae30a12aa95942814957d8bc1ce7366a7107d7affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References