CVE-2024-42253

gpio: pca953x: fix pca953x_irq_bus_sync_unlock race

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

gpio: pca953x: fix pca953x_irq_bus_sync_unlock race

Ensure that `i2c_lock' is held when setting interrupt latch and mask in
pca953x_irq_bus_sync_unlock() in order to avoid races.

The other (non-probe) call site pca953x_gpio_set_multiple() ensures the
lock is held before calling pca953x_write_regs().

The problem occurred when a request raced against irq_bus_sync_unlock()
approximately once per thousand reboots on an i.MX8MP based system.

* Normal case

0-0022: write register AI|3a {03,02,00,00,01} Input latch P0
0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0
0-0022: write register AI|08 {ff,00,00,00,00} Output P3
0-0022: write register AI|12 {fc,00,00,00,00} Config P3

* Race case

0-0022: write register AI|08 {ff,00,00,00,00} Output P3
0-0022: write register AI|08 {03,02,00,00,01} *** Wrong register ***
0-0022: write register AI|12 {fc,00,00,00,00} Config P3
0-0022: write register AI|49 {fc,fd,ff,ff,fe} Interrupt mask P0

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gpio: pca953x: corrige la ejecución pca953x_irq_bus_sync_unlock Asegúrese de que se mantenga `i2c_lock' al configurar el bloqueo de interrupción y la máscara en pca953x_irq_bus_sync_unlock() para evitar ejecuciones. El otro sitio de llamada (que no es de sonda) pca953x_gpio_set_multiple() garantiza que el bloqueo se mantenga antes de llamar a pca953x_write_regs(). El problema ocurrió cuando una solicitud corrió contra irq_bus_sync_unlock() aproximadamente una vez por cada mil reinicios en un sistema basado en i.MX8MP. * Caso normal 0-0022: escribir registro AI|3a {03,02,00,00,01} Enclavamiento de entrada P0 0-0022: escribir registro AI|49 {fc,fd,ff,ff,fe} Máscara de interrupción P0 0 -0022: escribir registro AI|08 {ff,00,00,00,00} Salida P3 0-0022: escribir registro AI|12 {fc,00,00,00,00} Configuración P3 * Caso de ejecución 0-0022: escribir registro AI|08 {ff,00,00,00,00} Salida P3 0-0022: escribir registro AI|08 {03,02,00,00,01} *** Registro incorrecto *** 0-0022: escribir registro AI|12 {fc,00,00,00,00} Config P3 0-0022: escribir registro AI|49 {fc,fd,ff,ff,fe} Máscara de interrupción P0

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-07-30 CVE Reserved
2024-08-08 CVE Published
2024-09-07 EPSS Updated
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/58a5c93bd1a6e949267400080f07e57ffe05ec34	2024-07-25
https://git.kernel.org/stable/c/e2ecdddca80dd845df42376e4b0197fe97018ba2	2024-07-25
https://git.kernel.org/stable/c/de7cffa53149c7b48bd1bb29b02390c9f05b7f41	2024-07-25
https://git.kernel.org/stable/c/bfc6444b57dc7186b6acc964705d7516cbaf3904	2024-06-21

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.1.101 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.101"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.6.42 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.42"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.9.11 Search vendor "Linux" for product "Linux Kernel" and version " < 6.9.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.10 Search vendor "Linux" for product "Linux Kernel" and version " < 6.10"		en		Affected