CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock
Description
In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock Locking is disabled in the regmap config as this driver uses its own lock. This means that all calls to regmap functions (read or write) must hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do this, and it was therefore possible that multiple threads could cause an incorrect register to be read/written. A previous patch partly fixed this, but only protected the write to the interrupt mask register, and not the read from the direction register.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Oct. 30, 2026, 1:20 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the latest Linux kernel patch for the PCA953X driver.
- Ensure all regmap calls are protected by the I2C lock.
- Verify interrupt mask and direction registers are correctly accessed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74733.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74733 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74733
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74733 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74733 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 30, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74733.json">CVE-2026-74733</a> Added Reference https://git.kernel.org/stable/c/58ed56c093a857c19f04cf3db1f02d2e793aec88 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 21, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74733.json">CVE-2026-74733</a> Added Reference https://git.kernel.org/stable/c/41255e64eb9dd87b0b8675f4e47a9c67bcef6e39 Added Reference https://git.kernel.org/stable/c/5d05c4252c09ce10624be2197853c80bf87424e4 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 16, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-74733', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-16T19:15:53.820928Z'} -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74733.json">CVE-2026-74733</a> Added Reference https://git.kernel.org/stable/c/9dc325327babe7f159e84cbe9380a45342da0585 Added Reference https://git.kernel.org/stable/c/bf3f37c2d40b51deb79aea910f28999d7c8c6b5a Added Reference https://git.kernel.org/stable/c/e6a2f5f845f50b0c4299bace5111f56d3390a090 Removed Reference https://git.kernel.org/stable/c/9dc325327babe7f159e84cbe9380a45342da0585 Removed Reference https://git.kernel.org/stable/c/e6a2f5f845f50b0c4299bace5111f56d3390a090 -
CVE Translated by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Translation Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: gpio: pca953x: corregir el bloqueo de regmap en pca953x_irq_bus_sync_unlock El bloqueo está deshabilitado en la configuración de regmap ya que este controlador usa su propio bloqueo. Esto significa que todas las llamadas a funciones de regmap (lectura o escritura) deben mantener el i2c_lock. La función pca953x_irq_bus_sync_unlock() no hizo esto, y por lo tanto era posible que múltiples hilos pudieran causar que se leyera/escribiera un registro incorrecto. Un parche anterior solucionó esto parcialmente, pero solo protegió la escritura en el registro de máscara de interrupción, y no la lectura del registro de dirección. -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'bfc6444b57dc7186b6acc964705d7516cbaf3904', 'lessThan': 'e6a2f5f845f50b0c4299bace5111f56d3390a090', 'versionType': 'git'}, {'status': 'affected', 'version': 'bfc6444b57dc7186b6acc964705d7516cbaf3904', 'lessThan': '9dc325327babe7f159e84cbe9380a45342da0585', 'versionType': 'git'}, {'status': 'affected', 'version': '58a5c93bd1a6e949267400080f07e57ffe05ec34', 'versionType': 'git'}, {'status': 'affected', 'version': 'e2ecdddca80dd845df42376e4b0197fe97018ba2', 'versionType': 'git'}, {'status': 'affected', 'version': 'de7cffa53149c7b48bd1bb29b02390c9f05b7f41', 'versionType': 'git'}, {'status': 'affected', 'version': '6.1.101', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.6.42', 'lessThan': '6.7', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.9.11', 'lessThan': '6.10', 'versionType': 'semver'}], 'programFiles': ['drivers/gpio/gpio-pca953x.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/gpio/gpio-pca953x.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock Locking is disabled in the regmap config as this driver uses its own lock. This means that all calls to regmap functions (read or write) must hold the i2c_lock. The function pca953x_irq_bus_sync_unlock() did not do this, and it was therefore possible that multiple threads could cause an incorrect register to be read/written. A previous patch partly fixed this, but only protected the write to the interrupt mask register, and not the read from the direction register. Added Reference https://git.kernel.org/stable/c/9dc325327babe7f159e84cbe9380a45342da0585 Added Reference https://git.kernel.org/stable/c/e6a2f5f845f50b0c4299bace5111f56d3390a090