usb: cdns3: fix use-after-free in cdns3_gadget_exit()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98757
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:29 UTC
Updated2026-10-19 10:19:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: cdns3: fix use-after-free in cdns3_gadget_exit() cdns3_gadget_start() arms two works on system_freezable_wq: pending_status_wq for the deferred ep0 status stage and aligned_buf_wq for realigned request buffers. Both handlers use the cdns3_device the works are embedded in, and cdns3_pending_setup_status_handler() also calls the ep0 request completion. cdns3_gadget_exit() does not wait for these works. It frees all endpoints and aligned buffers and drops the last reference to the gadget device, which frees priv_dev, so a work queued before the exit can run after the free. Fix this by waiting for both works after the gadget driver is unbound and the IRQ is freed, when no new work can be queued, and before the endpoints and buffers are released. This issue was found by an in-house static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7733f6c32e36ff9d7adadf40001039bf219b1cbe cc448700db656cceb4b411bf99a2e7132144d035 git Not specified
CNA Linux Linux affected 7733f6c32e36ff9d7adadf40001039bf219b1cbe 95160fe606e685ff18de1e6ddcbc08289476004e git Not specified
CNA Linux Linux affected 7733f6c32e36ff9d7adadf40001039bf219b1cbe 159dada48ee2d53eff46e66a8011d67b2c209bbc git Not specified
CNA Linux Linux affected 7733f6c32e36ff9d7adadf40001039bf219b1cbe ebe9b68c396792c15d0ac690d592e449e74ed804 git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/95160fe606e685ff18de1e6ddcbc08289476004e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/159dada48ee2d53eff46e66a8011d67b2c209bbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc448700db656cceb4b411bf99a2e7132144d035 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebe9b68c396792c15d0ac690d592e449e74ed804 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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