CVE-2026-74405
In the Linux kernel, the following vulnerability has been resolved:
OPP: Fix race between OPP addition and lookup
A race exists between dev_pm_opp_add_dynamic() and
dev_pm_opp_find_freq_exact():
CPU0 (add) CPU1 (lookup)
------------------------------- ------------------------------
_opp_add()
mutex_lock()
list_add(&new_opp->node, head)
mutex_unlock() _opp_table_find_key()
mutex_lock()
dev_pm_opp_get(opp)
kref_get()
mutex_unlock()
kref_init(&new_opp->kref)
dev_pm_opp_put()
kref_put_mutex()
The newly added OPP is inserted into the list before its kref is
initialized. A concurrent lookup can find this OPP and increment its
reference count while it is still uninitialized, leading to refcount
corruption and a potential premature free.
Fix this by initializing ->kref and ->opp_table before making the OPP
visible via list_add(). This ensures any concurrent lookup observes a
fully initialized object.
[ Viresh: Updated commit log ]
CSIRTS triage
- What
- The OPP (Operating Performance Points) subsystem has a race condition between adding new operating points and looking them up.
- Who is affected
- Systems with dynamic voltage and frequency scaling (DVFS) enabled, common on mobile and embedded platforms.
- Urgency
- Medium severity (CVSS 4.1); no known exploitation but race conditions in frequency scaling can cause system instability.
- Action
- Apply kernel patch that synchronizes OPP addition and lookup operations.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (2)
- highCVE-2026-74405: In the Linux kernel, the following vulnerability has been resolved: OPP: Fix race between OPP …nvd · 2026-08-15
- mediumCVE-2026-74405: OPP: Fix race between OPP addition and lookupmsrc · 2026-08-11
External references
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