# CVE-2022-48878: linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: hci_qca: Fix driver shutdown on close...

CVE-2022-48878 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48878, released August 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48878
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: hci_qca: Fix driver shutdown on closed serdev  The driver shutdown callback (which sends EDL_SOC_RESET to the device over serdev) should not be invoked when HCI device is not open (e.g. if hci_dev_open_sync() failed), because the serdev and its TTY are not open either.  Also skip this step if device is powered off (qca_power_shutdown()).  The shutdown callback causes use-after-free during system reboot with Qualcomm Atheros Bluetooth:    Unable to handle kernel paging request at virtual address   0072662f67726fd7   ...   CPU: 6 PID: 1 Comm: systemd-shutdow Tainted: G        W   6.1.0-rt5-00325-g8a5f56bcfcca #8   Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)   Call trace:    tty_driver_flush_buffer+0x4/0x30    serdev_device_write_flush+0x24/0x34    qca_serdev_shutdown+0x80/0x130 [hci_uart]    device_shutdown+0x15c/0x260    kernel_restart+0x48/0xac  KASAN report:    BUG: KASAN: use-after-free in tty_driver_flush_buffer+0x1c/0x50   Read of size 8 at addr ffff16270c2e0018 by task systemd-shutdow/1    CPU: 7 PID: 1 Comm: systemd-shutdow Not tainted   6.1.0-next-20221220-00014-gb85aaf97fb01-dirty #28   Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)   Call trace:    dump_backtrace.part.0+0xdc/0xf0    show_stack+0x18/0x30    dump_stack_lvl+0x68/0x84    print_report+0x188/0x488    kasan_report+0xa4/0xf0    __asan_load8+0x80/0xac    tty_driver_flush_buffer+0x1c/0x50    ttyport_write_flush+0x34/0x44    serdev_device_write_flush+0x48/0x60    qca_serdev_shutdown+0x124/0x274    device_shutdown+0x1e8/0x350    kernel_restart+0x48/0xb0    __do_sys_reboot+0x244/0x2d0    __arm64_sys_reboot+0x54/0x70    invoke_syscall+0x60/0x190    el0_svc_common.constprop.0+0x7c/0x160    do_el0_svc+0x44/0xf0    el0_svc+0x2c/0x6c    el0t_64_sync_handler+0xbc/0x140    el0t_64_sync+0x190/0x194

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.8-1 | [DEBIAN-CVE-2022-48878](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48878.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.8-1 | [DEBIAN-CVE-2022-48878](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48878.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.8-1 | [DEBIAN-CVE-2022-48878](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48878.md) | Aug 21, 2024 |

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