drm/xe/i2c: cancel the client work on remove

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Summary

CVECVE-2026-99001
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:22 UTC
Updated2026-10-23 13:17:22 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/xe/i2c: cancel the client work on remove xe_i2c_notifier() stores the DesignWare adapter in i2c->adapter and schedules i2c->work when the adapter is registered under the xe I2C platform device, and xe_i2c_client_work() then instantiates the AMC client device on that adapter. xe_i2c_remove() tears down the AMC, unregisters the client devices, the bus notifier and the adapter platform device, but it never drains i2c->work. A work item that is still queued or running when the adapter is unregistered dereferences i2c->adapter in i2c_new_client_device() after platform_device_unregister() has released the adapter. The work item is also embedded in the devm-allocated struct xe_i2c, so a work item still queued after the drm device devm unwind frees that allocation runs its callback on freed memory. The bus notifier is the only thing that schedules this work, and it is unregistered after the client devices. An instance that is still queued when the teardown runs can therefore write i2c->client[XE_I2C_CLIENT_AMC] while the loop is unregistering and clearing the same array, and an AMC client it instantiates late is only cleaned up by the adapter's own child sweep in i2c_del_adapter(). Move bus_unregister_notifier() in front of the client teardown loop and cancel the work right after it, so no new instance can be scheduled and a queued instance is drained before the client array is touched. A running instance still finds a live adapter, since the adapter is unregistered later. (cherry picked from commit a23f27d5ec11c3f418c5e5531eea34ccda2b5b20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f0e53aadd702c64b2c2090996751c9be043f9e80 2efa187fd4c9b8d7edcae0c1acf46739ce39fd01 git Not specified
CNA Linux Linux affected f0e53aadd702c64b2c2090996751c9be043f9e80 175d654cd48320ad52d0f82dc3f4e3c063c3c5ca git Not specified
CNA Linux Linux affected f0e53aadd702c64b2c2090996751c9be043f9e80 611857adc9e7b0ee1239a0baf38498922ca5a12e git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.58 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/611857adc9e7b0ee1239a0baf38498922ca5a12e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/175d654cd48320ad52d0f82dc3f4e3c063c3c5ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2efa187fd4c9b8d7edcae0c1acf46739ce39fd01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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