i3c: master: Fix use-after-free of master->this

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Summary

CVECVE-2026-93200
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:16 UTC
Updated2026-09-17 17:18:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: i3c: master: Fix use-after-free of master->this sysfs attribute callbacks for the master controller device dereference master->this. However, master->this is freed in i3c_master_detach_free_devs() before the master device itself is released. As a result, sysfs accesses can dereference a freed master->this pointer, leading to a use-after-free. Keep master->this alive until i3c_masterdev_release(), which is called after the master device and its sysfs state are being torn down. Do not free master->this as part of the normal device detach path. On the error path in i3c_master_set_info(), reset master->this and bus.cur_master to NULL before freeing the allocated device.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 4f3145db05fede36b35f8249b8acde5bd5d54864 git Not specified
CNA Linux Linux affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 50034d8d0f797c3a7a599f750a7d3e792e80dea5 git Not specified
CNA Linux Linux affected 3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 feb0ed76601f3c2f91f08688c5a7d8b9d382f720 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 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/50034d8d0f797c3a7a599f750a7d3e792e80dea5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/feb0ed76601f3c2f91f08688c5a7d8b9d382f720 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f3145db05fede36b35f8249b8acde5bd5d54864 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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