CVE-2024-46691 Information

Description

In the Linux kernel the following vulnerability has been resolved:

usb: typec: ucsi: Move unregister out of atomic section

Commit ‘9329933699b3 (\soc: qcom: pmic_glink: Make client-lock non-sleeping)’ moved the pmic_glink client list under a spinlock as it is accessed by the rpmsg/glink callback which in turn is invoked from IRQ context.

This means that ucsi_unregister() is now called from atomic context which isn’t feasible as it’s expecting a sleepable context. An effort is under way to get GLINK to invoke its callbacks in a sleepable context but until then lets schedule the unregistration.

A side effect of this is that ucsi_unregister() can now happen after the remote processor and thereby the communication link with it is gone. pmic_glink_send() is amended with a check to avoid the resulting NULL pointer dereference. This does however result in the user being informed about this error by the following entry in the kernel log:

ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI write request: -5

CVSS Vector

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

Reference

https://git.kernel.org/stable/c/095b0001aefddcd9361097c971b7debc84e72714 https://git.kernel.org/stable/c/11bb2ffb679399f99041540cf662409905179e3a

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.5