CVE-2023-54220

serial: 8250: Fix oops for port->pm on uart_change_pm()

State: Published
Severity: 7.8 High
Published: Dec 30, 2025
Updated: Oct 15, 2026
Reserved: Dec 30, 2025

Description

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().

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	490bf37eaabb0a857ed1ae8e75d8854e41662f1c to before 66f3e55960698c874b0598277913b478ecd29573Affected c9e080c3005fd183c56ff8f4d75edb5da0765d2c to before 720a297b334e85d34099e83d1f375b92c3efedd6Affected d5cd2928d31042a7c0a01464f9a8d95be736421d to before b653289ca6460a6552c8590b75dfa84a0140a46bAffected 2c86a1305c1406f45ea780d06953c484ea1d9e6e to before bd70d0b28010d560a8be96b44fea86fe2ba016aeAffected 1ba5594739d858e524ff0f398ee1ebfe0a8b9d41 to before 18e27df4f2b4e257c317ba8076f31a888f6cc64bAffected af4d6dbb1a92ea424ad1ba1d0c88c7fa2345d872 to before 0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6cAffected 04e82793f068d2f0ffe62fcea03d007a8cdc16a7 to before 375806616f8c772c33d40e112530887b37c1a816Affected 04e82793f068d2f0ffe62fcea03d007a8cdc16a7 to before dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534Affected 8e596aed5f2f98cf3e6e98d6fe1d689f4a319308Affected 4.14.316 to before 4.14.324Affected 4.19.284 to before 4.19.293Affected 5.4.244 to before 5.4.255Affected 5.10.181 to before 5.10.192Affected 5.15.113 to before 5.15.128Affected 6.1.30 to before 6.1.47Affected 6.3.4 to before 6.4Affected
LinuxLinux	6.4Affected before 6.4Not affected 4.14.324 through 4.14.Not affected 4.19.293 through 4.19.Not affected 5.4.255 through 5.4.Not affected 5.10.192 through 5.10.Not affected 5.15.128 through 5.15.Not affected 6.1.47 through 6.1.Not affected 6.4.12 through 6.4.*Not affected 6.5 and laterNot affected

Product

Versions

LinuxLinux

490bf37eaabb0a857ed1ae8e75d8854e41662f1c to before 66f3e55960698c874b0598277913b478ecd29573Affected
c9e080c3005fd183c56ff8f4d75edb5da0765d2c to before 720a297b334e85d34099e83d1f375b92c3efedd6Affected
d5cd2928d31042a7c0a01464f9a8d95be736421d to before b653289ca6460a6552c8590b75dfa84a0140a46bAffected
2c86a1305c1406f45ea780d06953c484ea1d9e6e to before bd70d0b28010d560a8be96b44fea86fe2ba016aeAffected
1ba5594739d858e524ff0f398ee1ebfe0a8b9d41 to before 18e27df4f2b4e257c317ba8076f31a888f6cc64bAffected
af4d6dbb1a92ea424ad1ba1d0c88c7fa2345d872 to before 0c05493341d6f2097f75f0a5dbb7b53a9e8c5f6cAffected
04e82793f068d2f0ffe62fcea03d007a8cdc16a7 to before 375806616f8c772c33d40e112530887b37c1a816Affected
04e82793f068d2f0ffe62fcea03d007a8cdc16a7 to before dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534Affected
8e596aed5f2f98cf3e6e98d6fe1d689f4a319308Affected
4.14.316 to before 4.14.324Affected
4.19.284 to before 4.19.293Affected
5.4.244 to before 5.4.255Affected
5.10.181 to before 5.10.192Affected
5.15.113 to before 5.15.128Affected
6.1.30 to before 6.1.47Affected
6.3.4 to before 6.4Affected

LinuxLinux

6.4Affected
before 6.4Not affected
4.14.324 through 4.14.*Not affected
4.19.293 through 4.19.*Not affected
5.4.255 through 5.4.*Not affected
5.10.192 through 5.10.*Not affected
5.15.128 through 5.15.*Not affected
6.1.47 through 6.1.*Not affected
6.4.12 through 6.4.*Not affected
6.5 and laterNot affected

References

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