{"id":"CVE-2026-64346","state":"PUBLISHED","title":"usb: gadget: udc: Fix use-after-free in gadget_match_driver","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A race condition exists where\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\nwhile gadget_match_driver() concurrently accesses the freed udc memory\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\nNULL pointer dereference when the freed memory is zeroed:\n\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\n...\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\n\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\n\nFix this by ensuring the udc structure remains allocated until the\ngadget is released. To achieve this, introduce a new\nusb_gadget_release() routine to the core. When the gadget is added,\nusb_add_gadget() stores the gadget's release routine in the udc\nstructure and takes a reference to the udc. When the gadget is\nreleased, usb_gadget_release() drops the reference to the udc and\nthen calls the gadget's release routine.","publishedAt":"2026-07-25T08:50:07.680Z","updatedAt":"2026-08-17T04:53:51.249Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"50eeb8e8a4f389efc91b93cff14a683e714ec194","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"7a5214dae906d9f58e07bc4995e8181ee74439f4","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"d026f71df141c9b064ff32a78af5391a31ef75c2","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"b52476a83d9e12df00765359d728a875b128bef1","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"54fa390aae393eb130f307a85562e3001cc39a52","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/core.c"]}],"references":["https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194","https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4","https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2","https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1","https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52","https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64346.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64346","state":"PUBLISHED","datePublished":"2026-07-25T08:50:07.680Z","dateUpdated":"2026-08-17T04:53:51.249Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.782Z"},"containers":{"cna":{"title":"usb: gadget: udc: Fix use-after-free in gadget_match_driver","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A race condition exists where\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\nwhile gadget_match_driver() concurrently accesses the freed udc memory\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\nNULL pointer dereference when the freed memory is zeroed:\n\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\n...\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\n\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\n\nFix this by ensuring the udc structure remains allocated until the\ngadget is released. To achieve this, introduce a new\nusb_gadget_release() routine to the core. When the gadget is added,\nusb_add_gadget() stores the gadget's release routine in the udc\nstructure and takes a reference to the udc. When the gadget is\nreleased, usb_gadget_release() drops the reference to the udc and\nthen calls the gadget's release routine."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"50eeb8e8a4f389efc91b93cff14a683e714ec194","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"7a5214dae906d9f58e07bc4995e8181ee74439f4","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"d026f71df141c9b064ff32a78af5391a31ef75c2","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"b52476a83d9e12df00765359d728a875b128bef1","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"54fa390aae393eb130f307a85562e3001cc39a52","versionType":"git"},{"version":"fc274c1e997314bf47f6a62c79b5d7e554ed59c4","status":"affected","lessThan":"67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/udc/core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194"},{"url":"https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4"},{"url":"https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2"},{"url":"https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1"},{"url":"https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52"},{"url":"https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:51.249Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}