CVE-2023-54220

In the Linux kernel, the following vulnerability has been resolved: serial: 8250: Fix oops for port->pm on uart_change_pm() Unloading a hardware specific 8250 driver can produce error "Unable to handle kernel paging request at virtual address" about ten seconds after unloading the driver. This happens on uart_hangup() calling uart_change_pm(). Turns out commit 04e82793f068 ("serial: 8250: Reinit port->pm on port specific driver unbind") was only a partial fix. If the hardware specific driver has initialized port->pm function, we need to clear port->pm too. Just reinitializing port->ops does not do this. Otherwise serial8250_pm() will call port->pm() instead of serial8250_do_pm().

CVSS 3.1

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)

Published

2025-12-30

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6c
• https://git.kernel.org/stable/c/18e27df4f2b4e257c317ba8076f31a888f6cc64b
• https://git.kernel.org/stable/c/375806616f8c772c33d40e112530887b37c1a816
• https://git.kernel.org/stable/c/66f3e55960698c874b0598277913b478ecd29573
• https://git.kernel.org/stable/c/720a297b334e85d34099e83d1f375b92c3efedd6

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