hwmon: (pmbus/core) Protect regulator operations with mutex
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.143, 6.12.92, 6.18.21, 6.19.11
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 · fixed in b26849cffaa7c43355b82e9bef3725e786973a1a; From ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 · fixed in acf04e2863132f6d9222f71f3a76fb9782cbe061; From ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 · fixed in 4e9d723d9f198b86f6882a84c501ba1f39e8d055; From ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 · fixed in 2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07; From ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 · fixed in 754bd2b4a084b90b5e7b630e1f423061a9b9b761
- Linux Linux
3.19
- KernelLinux
From 3.19.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.92; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11