CVE-2023-54220

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().

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References

Other 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 https://git.kernel.org/stable/c/b653289ca6460a6552c8590b75dfa84a0140a46b https://git.kernel.org/stable/c/bd70d0b28010d560a8be96b44fea86fe2ba016ae https://git.kernel.org/stable/c/dfe2aeb226fd5e19b0ee795f4f6ed8bc494c1534

Frequently Asked Questions

What is 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().

How do I check if I'm vulnerable to CVE-2023-54220? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2023-54220

Description

References

Other References

Frequently Asked Questions

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