# 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.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 15 Aug 2026
- **Updated:** 21 Oct 2026
- **Also known as:** AZL-96045, BELL-CVE-2026-74405, DEBIAN-CVE-2026-74405, GHSA-5fpw-5c2c-j4pp, UBUNTU-CVE-2026-74405

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74405 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-74405 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-74405/ (Markdown: https://insights.sbomify.com/CVE-2026-74405/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74405
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74405
- OSV: https://osv.dev/vulnerability/CVE-2026-74405

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74405/
Summaries are generated and may contain mistakes; the official description above is the record.