In the Linux kernel, the following vulnerability has been resolved:
hwmon: (pmbus/core) Protect regulator operations with mutex
The regulator operations pmbus_regulator_get_voltage(),
pmbus_regulator_set_voltage(), and pmbus_regulator_list_voltage()
access PMBus registers and shared data but were not protected by
the update_lock mutex. This could lead to race conditions.
However, adding mutex protection directly to these functions causes
a deadlock because pmbus_regulator_notify() (which calls
regulator_notifier_call_chain()) is often called with the mutex
already held (e.g., from pmbus_fault_handler()). If a regulator
callback then calls one of the now-protected voltage functions,
it will attempt to acquire the same mutex.
Rework pmbus_regulator_notify() to utilize a worker function to
send notifications outside of the mutex protection. Events are
stored as atomics in a per-page bitmask and processed by the worker.
Initialize the worker and its associated data during regulator
registration, and ensure it is cancelled on device removal using
devm_add_action_or_reset().
While at it, remove the unnecessary include of linux/of.h.
References
Configurations
Configuration 1 (hide)
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History
01 Jun 2026, 17:16
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| References |
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28 Apr 2026, 13:06
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| First Time |
Linux
Linux linux Kernel |
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| CWE | CWE-667 | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:3.19:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
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| References | () https://git.kernel.org/stable/c/2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07 - Patch | |
| References | () https://git.kernel.org/stable/c/4e9d723d9f198b86f6882a84c501ba1f39e8d055 - Patch | |
| References | () https://git.kernel.org/stable/c/754bd2b4a084b90b5e7b630e1f423061a9b9b761 - Patch |
27 Apr 2026, 15:16
| Type | Values Removed | Values Added |
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| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.1 |
22 Apr 2026, 14:16
| Type | Values Removed | Values Added |
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| New CVE |
Information
Published : 2026-04-22 14:16
Updated : 2026-06-01 17:16
NVD link : CVE-2026-31486
Mitre link : CVE-2026-31486
CVE.ORG link : CVE-2026-31486
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-667
Improper Locking