CVE-2022-48838 — usb: gadget: Fix use-after-free bug by not setting udc->dev.driver

Affected: Linux

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 alw…

USN-7039-1 — linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities

Affected: Ubuntu:Pro:14.04:LTS: linux-aws, Ubuntu:Pro:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:16.04:LTS: linux, Ubuntu:Pro:16.04:LTS: linux-aws, Ubuntu:Pro:16.04:LTS: linux-kvm

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - GPU drivers; - Input Device (Tablet) drivers; - Modular ISDN driver; - Multiple devices driver; - Network drivers; - Near Field Communication (NFC) drivers; - SCSI drivers; - GCT GDM724x LTE driver; - USB subsystem; - VFIO drivers; - GFS2 file system; - JFS file system; - NILFS2 file system; - Networking core; - IPv4 networking; - L2TP protocol; - Netfilter; - RxRPC session sockets; (CVE-2024-26651, CVE-2024-38583, CVE-2023-52527, CVE-2024-26880, CVE-2022-48850, CVE-2024-26733, CVE-2021-47188, CVE-2024-42154, CVE-2023-52809, CVE-2024-42228, CVE-2022-48863, CVE-2022-48836, CVE-2022-48838, CVE-2024-26677, CVE-2024-27437, CVE-2022-48857, CVE-2022-48791, CVE-2021-47181, CVE-2024-26851, CVE-2024-40902, CVE-2022-48851, CVE-2024-38570)

Most recent entries from all

CVE-2022-48838 — usb: gadget: Fix use-after-free bug by not setting udc->dev.driver

USN-7039-1 — linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities