Exploited vulnerability

CVE-2025-39964

TLP:CLEAR

Linux Kernel Race Condition Vulnerability

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.

Facts

Vendor: Linux
Product: Kernel
CVSS: 7.8
EPSS (probability of exploitation within 30 days): 1.6 %
On CISA's Known Exploited Vulnerabilities list since: 18 September 2026
First known exploitation: 18 September 2026
CISA's deadline for US federal agencies: 21 September 2026
Weakness: CWE-362
First seen by Risk Letters: 18 September 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD