drm/amd/display: Fix DM I2C teardown race

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Summary

CVECVE-2026-93068
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:00 UTC
Updated2026-09-17 17:18:00 UTC
DescriptionIn 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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 8ee385305e8902fa6fbfd66b5a112238292567b6 git Not specified
CNA Linux Linux affected 5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 6970ec944567f109ac4240f9aea58158ee8a18cd git Not specified
CNA Linux Linux affected 5b3eca05cfb02ed0dbd7097c056fb08ce5f76fe3 e4ae30a12aa95942814957d8bc1ce7366a7107d7 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6970ec944567f109ac4240f9aea58158ee8a18cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e4ae30a12aa95942814957d8bc1ce7366a7107d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ee385305e8902fa6fbfd66b5a112238292567b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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