CVE-2026-74405 OPP: Fix race between OPP addition and lookup
A race condition in the Linux kernel OPP subsystem allows refcount corruption, potentially leading to premature memory free and system instability or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74405?
CVE-2026-74405 is a high-severity vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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 ]
Which versions are affected by CVE-2026-74405?
How do I fix CVE-2026-74405?
Apply the vendor's patch.
Is CVE-2026-74405 being exploited?
There is no known exploitation of CVE-2026-74405 in the wild and no public exploit code.
Sources
Also known as AZL-96045, BELL-CVE-2026-74405, DEBIAN-CVE-2026-74405, GHSA-5fpw-5c2c-j4pp, UBUNTU-CVE-2026-74405.