CVE - CVE-2022-48838

CVE-ID
CVE-2022-48838	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: Fix use-after-free bug by not setting udc->dev.driver The syzbot fuzzer found a use-after-free bug: BUG: KASAN: use-after-free in dev_uevent+0x712/0x780 drivers/base/core.c:2320 Read of size 8 at addr ffff88802b934098 by task udevd/3689 CPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 dev_uevent+0x712/0x780 drivers/base/core.c:2320 uevent_show+0x1b8/0x380 drivers/base/core.c:2391 dev_attr_show+0x4b/0x90 drivers/base/core.c:2094 Although the bug manifested in the driver core, the real cause was a race with the gadget core. dev_uevent() does: if (dev->driver) add_uevent_var(env, "DRIVER=%s", dev->driver->name); and between the test and the dereference of dev->driver, the gadget core sets dev->driver to NULL. The race wouldn't occur if the gadget core registered its devices on a real bus, using the standard synchronization techniques of the driver core. However, it's not necessary to make such a large change in order to fix this bug; all we need to do is make sure that udc->dev.driver is always NULL. In fact, there is no reason for udc->dev.driver ever to be set to anything, let alone to the value it currently gets: the address of the gadget's driver. After all, a gadget driver only knows how to manage a gadget, not how to manage a UDC. This patch simply removes the statements in the gadget core that touch udc->dev.driver.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646 URL:https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646 MISC:https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740 URL:https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740 MISC:https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a URL:https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a MISC:https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5 URL:https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5 MISC:https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e URL:https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e MISC:https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b URL:https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b MISC:https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e URL:https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e MISC:https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3 URL:https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3
Assigning CNA
kernel.org
Date Record Created
20240716	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240716)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)