CVE-2026-31486hwmon: (pmbus/core) Protect regulator operations with mutex
- 7.1HighCVSS base score
- 0.10%Exploitation in 30 daysEPSS · top 99% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
ID reserved
By Linux
- 44 days later
· 44 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.10% · top 99% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.
Affected products
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < f0c9ea9c3a208e79c812e10e2bcef87b46564f01
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < b26849cffaa7c43355b82e9bef3725e786973a1a
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < acf04e2863132f6d9222f71f3a76fb9782cbe061
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < 4e9d723d9f198b86f6882a84c501ba1f39e8d055
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < 2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07
- affected ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 – < 754bd2b4a084b90b5e7b630e1f423061a9b9b761
- affected 3.19
- unaffected < 3.19
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.21 – ≤ 6.18.*
- unaffected 6.19.11 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/f0c9ea9c3a208e79c812e10e2bcef87b46564f01 (opens in a new tab)
- https://git.kernel.org/stable/c/b26849cffaa7c43355b82e9bef3725e786973a1a (opens in a new tab)
- https://git.kernel.org/stable/c/acf04e2863132f6d9222f71f3a76fb9782cbe061 (opens in a new tab)
- https://git.kernel.org/stable/c/4e9d723d9f198b86f6882a84c501ba1f39e8d055 (opens in a new tab)
- https://git.kernel.org/stable/c/2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07 (opens in a new tab)
- https://git.kernel.org/stable/c/754bd2b4a084b90b5e7b630e1f423061a9b9b761 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-24852 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-31486)Record last updated .