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CVE-2025-39964: Linux Kernel Race Condition Vulnerability

Linux Kernel · in CISA KEV since 2026-09-18

2026-09-18added to KEV
2026-09-21federal remediation due date
0.79%EPSS exploit probability (30 days) 54.8th percentile
5.5 MEDIUMCVSS 3.1
Unknownknown ransomware use
340days from NVD publication to KEV

What it is

Linux Kernel contains a race condition vulnerability which allows concurrent writes to the same AF_ALG socket causing data to be unpredictably interleaved and creating inconsistencies in the socket's internal state.

Required action (CISA)

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CWECWE-362
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD published2025-10-13 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2025-39964.json · all KEV CVEs

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