# CVE-2022-49613: linux: In the Linux kernel, the following vulnerability has been resolved:  serial: 8250: Fix PM usage_count for console han...

CVE-2022-49613 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49613, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49613
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  serial: 8250: Fix PM usage_count for console handover  When console is enabled, univ8250_console_setup() calls serial8250_console_setup() before .dev is set to uart_port. Therefore, it will not call pm_runtime_get_sync(). Later, when the actual driver is going to take over univ8250_console_exit() is called. As .dev is already set, serial8250_console_exit() makes pm_runtime_put_sync() call with usage count being zero triggering PM usage count warning (extra debug for univ8250_console_setup(), univ8250_console_exit(), and serial8250_register_ports()):  [    0.068987] univ8250_console_setup ttyS0 nodev [    0.499670] printk: console [ttyS0] enabled [    0.717955] printk: console [ttyS0] printing thread started [    1.960163] serial8250_register_ports assigned dev for ttyS0 [    1.976830] printk: console [ttyS0] disabled [    1.976888] printk: console [ttyS0] printing thread stopped [    1.977073] univ8250_console_exit ttyS0 usage:0 [    1.977075] serial8250 serial8250: Runtime PM usage count underflow! [    1.977429] dw-apb-uart.6: ttyS0 at MMIO 0x4010006000 (irq = 33, base_baud = 115200) is a 16550A [    1.977812] univ8250_console_setup ttyS0 usage:2 [    1.978167] printk: console [ttyS0] printing thread started [    1.978203] printk: console [ttyS0] enabled  To fix the issue, call pm_runtime_get_sync() in serial8250_register_ports() as soon as .dev is set for an uart_port if it has console enabled.  This problem became apparent only recently because 82586a721595 ("PM: runtime: Avoid device usage count underflows") added the warning printout. I confirmed this problem also occurs with v5.18 (w/o the warning printout, obviously).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.14-1 | [DEBIAN-CVE-2022-49613](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49613.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.14-1 | [DEBIAN-CVE-2022-49613](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49613.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.14-1 | [DEBIAN-CVE-2022-49613](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49613.md) | Feb 26, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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