CVE-2026-64346usb: gadget: udc: Fix use-after-free in gadget_match_driver
- 7.8HighCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 94% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < 50eeb8e8a4f389efc91b93cff14a683e714ec194
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < 7a5214dae906d9f58e07bc4995e8181ee74439f4
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < d026f71df141c9b064ff32a78af5391a31ef75c2
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < b52476a83d9e12df00765359d728a875b128bef1
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < 54fa390aae393eb130f307a85562e3001cc39a52
- affected fc274c1e997314bf47f6a62c79b5d7e554ed59c4 – < 67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.96 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194 (opens in a new tab)
- https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4 (opens in a new tab)
- https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2 (opens in a new tab)
- https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1 (opens in a new tab)
- https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52 (opens in a new tab)
- https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48890 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64346)Record last updated .