usb: gadget: udc: Fix use-after-free in gadget_match_driver

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64346
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:16 UTC
Updated2026-07-27 05:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: udc: Fix use-after-free in gadget_match_driver The udc structure acts as the management structure for the gadget, but their lifecycles are decoupled. A race condition exists where usb_del_gadget() frees the udc memory (e.g., via mode-switch work) while gadget_match_driver() concurrently accesses the freed udc memory (e.g., via configfs), causing a Use-After-Free (UAF) that triggers a NULL pointer dereference when the freed memory is zeroed: [39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140 [39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60 ... [39430.911890][ T1171] usb_gadget_register_driver_owner+0x50/0xf8 [39430.911910][ T1171] gadget_dev_desc_UDC_store+0xf4/0x140 [39430.931308][ T1171] configfs_write_iter+0xec/0x134 [39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode [39430.957287][ T1171] dwc3_gadget_exit+0x34/0x8c [39430.957304][ T1171] __dwc3_set_mode+0xc0/0x664 Fix this by ensuring the udc structure remains allocated until the gadget is released. To achieve this, introduce a new usb_gadget_release() routine to the core. When the gadget is added, usb_add_gadget() stores the gadget's release routine in the udc structure and takes a reference to the udc. When the gadget is released, usb_gadget_release() drops the reference to the udc and then calls the gadget's release routine.

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.107990000 (date 2026-07-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 50eeb8e8a4f389efc91b93cff14a683e714ec194 git Not specified
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 7a5214dae906d9f58e07bc4995e8181ee74439f4 git Not specified
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 d026f71df141c9b064ff32a78af5391a31ef75c2 git Not specified
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 b52476a83d9e12df00765359d728a875b128bef1 git Not specified
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 54fa390aae393eb130f307a85562e3001cc39a52 git Not specified
CNA Linux Linux affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f845852a5a8914277031f47d8de0f350fef52405 MITRE git.kernel.org
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