CVE-2026-64583usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown
- 7.8HighCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% 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: bdc: free IRQ and drain func_wake_notify before teardown The Broadcom BDC UDC driver registers its IRQ handler with devm_request_irq() in bdc_udc_init(), so the IRQ is released by devm only after bdc_remove() returns. devm releases resources in reverse LIFO order, but bdc_remove() runs bdc_udc_exit() and bdc_hw_exit() -> bdc_mem_free() manually before returning: bdc_udc_exit() tears down individual endpoint objects via bdc_free_ep(), while bdc_hw_exit() -> bdc_mem_free() frees and NULLs the DMA-coherent status-report ring (bdc->srr.sr_bds) and kfree()s bdc->bdc_ep_array. Both happen while the IRQ handler (bdc_udc_interrupt, requested with IRQF_SHARED) remains deliverable in the window up to the post-remove devm free_irq(). On receipt of a shared interrupt in that window, bdc_udc_interrupt() dereferences bdc->srr.sr_bds[bdc->srr.dqp_index] (NULL or freed DMA) and dispatches sr_handler callbacks that index into bdc_ep_array, causing a NULL-deref or use-after-free. The same window affects the delayed_work bdc->func_wake_notify, which is armed from the IRQ handler via bdc_sr_uspc() -> handle_link_state_change() -> schedule_delayed_work() and may self-rearm from its own callback bdc_func_wake_timer(). No cancel exists anywhere in the driver, so a queued work item that fires after bdc_remove() returns and the bdc structure is devm-freed dereferences freed memory. Replace devm_request_irq() with request_irq() and add an explicit free_irq(bdc->irq, bdc) in bdc_remove(). Clear BDC_GIE before free_irq() to stop the device from asserting interrupts, then free_irq() drains any in-flight handler, then cancel_delayed_work_sync() drains the func_wake_notify delayed work. This ordering ensures the IRQ handler and delayed work cannot interfere with the subsequent endpoint and DMA teardown in bdc_udc_exit() and bdc_hw_exit(). Wire the matching free_irq() into the bdc_udc_init() error path so the IRQ is released on probe failure, and route the bdc_init_ep() failure through err0 instead of returning directly. This issue was found by an in-house static analysis tool.
Timeline
ID reserved
By Linux
- 18 days later
· 18 days later
Published
- 17 days later
· 17 days 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 |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 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)
- 0.12% · top 98% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < eac1107e54679db2df2c36d8bba3b66d3ab6cbcd
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < 0b0b76e31b3991a899ae724eb97d359de0c0f1b1
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < 3fe181952b8a1aeb167d4503c794c0f5050f08ed
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < 1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < f6fc21ec7ccd83726ba766d73d0b8cc03e726475
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < dcf3e2f164435b5844706cb8eefef29ebee0eedb
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < d4964a74717107697999f48bcb4e80a9c0679a27
- affected efed421a94e62a7ddbc76acba4312b70e4be958f – < 0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb
- affected 3.19
- unaffected < 3.19
- unaffected 5.10.266 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.148 – ≤ 6.6.*
- unaffected 6.12.101 – ≤ 6.12.*
- unaffected 6.18.42 – ≤ 6.18.*
- unaffected 7.1.6 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/eac1107e54679db2df2c36d8bba3b66d3ab6cbcd (opens in a new tab)
- https://git.kernel.org/stable/c/0b0b76e31b3991a899ae724eb97d359de0c0f1b1 (opens in a new tab)
- https://git.kernel.org/stable/c/3fe181952b8a1aeb167d4503c794c0f5050f08ed (opens in a new tab)
- https://git.kernel.org/stable/c/1a1d7158420df6b8fa1efc0cdd6ab704801a4fc8 (opens in a new tab)
- https://git.kernel.org/stable/c/f6fc21ec7ccd83726ba766d73d0b8cc03e726475 (opens in a new tab)
- https://git.kernel.org/stable/c/dcf3e2f164435b5844706cb8eefef29ebee0eedb (opens in a new tab)
- https://git.kernel.org/stable/c/d4964a74717107697999f48bcb4e80a9c0679a27 (opens in a new tab)
- https://git.kernel.org/stable/c/0583f2fbf8f86ae3a0ce054f96783dd83e65d9bb (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-2026-53770 (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-2026-64583)Record last updated .