# CVE-2026-31480: tracing: Fix potential deadlock in cpu hotplug with osnoise

Status: published. Published: 2026-04-22. Updated: 2026-11-05.

In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix potential deadlock in cpu hotplug with osnoise

The following sequence may leads deadlock in cpu hotplug:

    task1        task2        task3
    -----        -----        -----

 mutex_lock(&interface_lock)

            [CPU GOING OFFLINE]

            cpus_write_lock();
            osnoise_cpu_die();
              kthread_stop(task3);
                wait_for_completion();

                      osnoise_sleep();
                        mutex_lock(&interface_lock);

 cpus_read_lock();

 [DEAD LOCK]

Fix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < cf929c21eeed5bd39873fb14bfdfff963fa6f1da (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < 7aa095ce7d224308cb6979956f0de8607df93d4f (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < ef41a85a55022e27cdaebf22a6676910b66f65aa (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < 03474a01c199de17a8e2d39b51df6beb9c76e831 (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7 (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < 7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f (affected, git); ≥ bce29ac9ce0bb0b0b146b687ab978378c21e9078; < 1f9885732248d22f788e4992c739a98c88ab8a55 (affected, git). Source: CNA: Linux
- Linux / Linux: 5.14 (affected); ≥ 0; < 5.14 (unaffected, semver); ≥ 5.15.203; ≤ 5.15.* (unaffected, semver); ≥ 6.1.168; ≤ 6.1.* (unaffected, semver); ≥ 6.6.131; ≤ 6.6.* (unaffected, semver); ≥ 6.12.80; ≤ 6.12.* (unaffected, semver); ≥ 6.18.21; ≤ 6.18.* (unaffected, semver); ≥ 6.19.11; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.10% as of 2026-11-05; percentile 0.60%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/cf929c21eeed5bd39873fb14bfdfff963fa6f1da (CNA: Linux)

- https://git.kernel.org/stable/c/7aa095ce7d224308cb6979956f0de8607df93d4f (CNA: Linux)

- https://git.kernel.org/stable/c/ef41a85a55022e27cdaebf22a6676910b66f65aa (CNA: Linux)

- https://git.kernel.org/stable/c/03474a01c199de17a8e2d39b51df6beb9c76e831 (CNA: Linux)

- https://git.kernel.org/stable/c/f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7 (CNA: Linux)

- https://git.kernel.org/stable/c/7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f (CNA: Linux)

- https://git.kernel.org/stable/c/1f9885732248d22f788e4992c739a98c88ab8a55 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-31480; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-31480; retrieved 2026-11-05; source updated Not reported

Revision: 98ddd6555c34d918f2234b98768c1a705107d1dc6cd22aa7cf69f90ecbf74cea

Canonical: https://y2.dev/cve/CVE-2026-31480

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