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high7.8Known exploited

CVE-2025-39964

Linux Kernel Race Condition Vulnerability

Exploited in the wild

This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-18. Federal due date: 2026-09-21.

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.

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 2.6.38 before 5.10.245
from 5.11 before 5.15.194
from 5.16 before 6.1.154
from 6.2 before 6.6.108
from 6.7 before 6.12.49
from 6.13 before 6.16.9
SiemensSimatic S7-1500 Cpu 1518-4 Pn\/Dp Mfp Firmware
from 3.1.6
SiemensSimatic S7-1500 Cpu 1518f-4 Pn\/Dp Mfp Firmware
from 3.1.6

Weakness classification

CWE-362

References