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In the Linux kernel, the following vulnerability has been...

Moderate severity Unreviewed Published Aug 8, 2024 to the GitHub Advisory Database • Updated Sep 6, 2024

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

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

References

Published by the National Vulnerability Database Aug 8, 2024
Published to the GitHub Advisory Database Aug 8, 2024
Last updated Sep 6, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.042%
(5th percentile)

Weaknesses

CVE ID

CVE-2024-42253

GHSA ID

GHSA-gr3w-p7mm-8pcq

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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