Riskcovery

CVE-2024-42253

gpio: pca953x: fix pca953x_irq_bus_sync_unlock race

State
Published
Severity
7.8 High
Published
Aug 8, 2024
Updated
Aug 5, 2026
Reserved
Jul 30, 2024

Read the record on cve.org

Description

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

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 44896beae605b93f2232301befccb7ef42953198 to before 58a5c93bd1a6e949267400080f07e57ffe05ec34Affected
  • 44896beae605b93f2232301befccb7ef42953198 to before e2ecdddca80dd845df42376e4b0197fe97018ba2Affected
  • 44896beae605b93f2232301befccb7ef42953198 to before de7cffa53149c7b48bd1bb29b02390c9f05b7f41Affected
  • 44896beae605b93f2232301befccb7ef42953198 to before bfc6444b57dc7186b6acc964705d7516cbaf3904Affected
LinuxLinux
  • 4.7Affected
  • before 4.7Not affected
  • 6.1.101 through 6.1.*Not affected
  • 6.6.42 through 6.6.*Not affected
  • 6.9.11 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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