Описание
In the Linux kernel, the following vulnerability has been resolved:
usb: typec: tcpm: recover after failure to start the frs ams
Reset the port if the tcpm fails to start the FAST_ROLE_SWAP AMS by
initiating error recovery on it.
This helps in cases where some cables (incorrectly) signal an FRS to
an FRS capable port during disconnection. The TCPC autonomously starts
sourcing VBUS on detecting the FRS signal. However, the VBUS sourcing is
left on when the FAST_ROLE_SWAP AMS fails to start (as tcpm_sink_tx_ok
is 0 as CC is open due to the cable disconnect). This is because the
code sets the state to INVALID_STATE without resetting the port state.
Log snippet before changes:
[ 101.401960] AMS FAST_ROLE_SWAP start
[ 101.401971] Sink TX No Go
[ 101.401982] sourcing vbus
[ 101.401987] VBUS on
[ 101.402159] VBUS on
[ 109.257809] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_READY, polarity 1, disconnected]
[ 111.267442] VBUS on
After changes:
[ 70.541211] AMS FAST_ROLE_SWAP start
[ 70.541220] Sink TX No Go
[ 70.541228] state change SNK_READY -> ERROR_RECOVERY [rev3 NONE_AMS]
[ 70.541362] VBUS on
[ 70.541365] sourcing vbus
[ 70.541367] VBUS on
[ 70.541374] state change ERROR_RECOVERY -> PORT_RESET [rev3 NONE_AMS]
[ 70.541410] disable vbus discharge ret:0
[ 70.543028] Setting usb_comm capable false
[ 70.544009] Setting voltage/current limit 0 mV 0 mA
[ 70.544034] polarity 0
[ 70.544239] Requesting mux state 0, usb-role 0, orientation 0
[ 70.555550] cc:=0
[ 70.555595] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev3 NONE_AMS]
[ 70.555697] VBUS off
[ 70.555702] VBUS VSAFE0V
[ 70.555762] CC1: 5 -> 0, CC2: 0 -> 0 [state PORT_RESET, polarity 0, disconnected]
[ 70.587794] VBUS off
[ 70.587799] VBUS VSAFE0V
[ 70.655672] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms]
[ 70.655682] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [rev3 NONE_AMS]
[ 70.655686] Start toggling
[ 70.656274] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
A flaw was found in the Linux kernel's USB Type-C Port Manager (TCPM). This issue may result in a denial of service (DoS) or unintended power delivery on the affected port. When a USB Type-C cable is disconnected while signaling a Fast Role Swap (FRS), the controller autonomously begins sourcing bus voltage (VBUS) power, but the role-swap sequence fails because the connection is broken. Due to improper state handling, the driver fails to trigger error recovery or reset the port, leaving power delivery active on the disconnected interface.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-8 | Fix deferred | ||
| Red Hat OpenShift Container Platform 4 | openshift/ose-rhel-coreos-9 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
4 Medium
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: recover after failure to start the frs ams Reset the port if the tcpm fails to start the FAST_ROLE_SWAP AMS by initiating error recovery on it. This helps in cases where some cables (incorrectly) signal an FRS to an FRS capable port during disconnection. The TCPC autonomously starts sourcing VBUS on detecting the FRS signal. However, the VBUS sourcing is left on when the FAST_ROLE_SWAP AMS fails to start (as tcpm_sink_tx_ok is 0 as CC is open due to the cable disconnect). This is because the code sets the state to INVALID_STATE without resetting the port state. Log snippet before changes: [ 101.401960] AMS FAST_ROLE_SWAP start [ 101.401971] Sink TX No Go [ 101.401982] sourcing vbus [ 101.401987] VBUS on [ 101.402159] VBUS on [ 109.257809] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_READY, polarity 1, disconnected] [ 111.267442] VBUS on After changes: [ 70.541211] AMS FAST_ROLE_SWAP start [ 70.54...
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: recover after failure to start the frs ams Reset the port if the tcpm fails to start the FAST_ROLE_SWAP AMS by initiating error recovery on it. This helps in cases where some cables (incorrectly) signal an FRS to an FRS capable port during disconnection. The TCPC autonomously starts sourcing VBUS on detecting the FRS signal. However, the VBUS sourcing is left on when the FAST_ROLE_SWAP AMS fails to start (as tcpm_sink_tx_ok is 0 as CC is open due to the cable disconnect). This is because the code sets the state to INVALID_STATE without resetting the port state. Log snippet before changes: [ 101.401960] AMS FAST_ROLE_SWAP start [ 101.401971] Sink TX No Go [ 101.401982] sourcing vbus [ 101.401987] VBUS on [ 101.402159] VBUS on [ 109.257809] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_READY, polarity 1, disconnected] [ 111.267442] VBUS on After changes: [ 70.541211] AMS FAST_ROLE_SWAP start [ 70.
usb: typec: tcpm: recover after failure to start the frs ams
In the Linux kernel, the following vulnerability has been resolved: u ...
In the Linux kernel, the following vulnerability has been resolved: usb: typec: tcpm: recover after failure to start the frs ams Reset the port if the tcpm fails to start the FAST_ROLE_SWAP AMS by initiating error recovery on it. This helps in cases where some cables (incorrectly) signal an FRS to an FRS capable port during disconnection. The TCPC autonomously starts sourcing VBUS on detecting the FRS signal. However, the VBUS sourcing is left on when the FAST_ROLE_SWAP AMS fails to start (as tcpm_sink_tx_ok is 0 as CC is open due to the cable disconnect). This is because the code sets the state to INVALID_STATE without resetting the port state. Log snippet before changes: [ 101.401960] AMS FAST_ROLE_SWAP start [ 101.401971] Sink TX No Go [ 101.401982] sourcing vbus [ 101.401987] VBUS on [ 101.402159] VBUS on [ 109.257809] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_READY, polarity 1, disconnected] [ 111.267442] VBUS on After changes: [ 70.541211] AMS FAST_ROLE_SWAP start [ ...
EPSS
4 Medium
CVSS3