| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21838: usb: gadget: core: flush gadget workqueue after device removal |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| usb: gadget: core: flush gadget workqueue after device removal |
| |
| device_del() can lead to new work being scheduled in gadget->work |
| workqueue. This is observed, for example, with the dwc3 driver with the |
| following call stack: |
| device_del() |
| gadget_unbind_driver() |
| usb_gadget_disconnect_locked() |
| dwc3_gadget_pullup() |
| dwc3_gadget_soft_disconnect() |
| usb_gadget_set_state() |
| schedule_work(&gadget->work) |
| |
| Move flush_work() after device_del() to ensure the workqueue is cleaned |
| up. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21838 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.12 with commit 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 and fixed in 6.1.130 with commit e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266 |
| Issue introduced in 3.12 with commit 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 and fixed in 6.6.80 with commit 859cb45aefa6de823b2fa7f229fe6d9562c9f3b7 |
| Issue introduced in 3.12 with commit 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 and fixed in 6.12.16 with commit f894448f3904d7ad66fecef8f01fe0172629e091 |
| Issue introduced in 3.12 with commit 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 and fixed in 6.13.4 with commit 97695b5a1b5467a4f91194db12160f56da445dfe |
| Issue introduced in 3.12 with commit 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 and fixed in 6.14 with commit 399a45e5237ca14037120b1b895bd38a3b4492ea |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21838 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/usb/gadget/udc/core.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/e3bc1a9a67ce33a2e761e6e7b7c2afc6cb9b7266 |
| https://git.kernel.org/stable/c/859cb45aefa6de823b2fa7f229fe6d9562c9f3b7 |
| https://git.kernel.org/stable/c/f894448f3904d7ad66fecef8f01fe0172629e091 |
| https://git.kernel.org/stable/c/97695b5a1b5467a4f91194db12160f56da445dfe |
| https://git.kernel.org/stable/c/399a45e5237ca14037120b1b895bd38a3b4492ea |
