CVE-2025-39964Vulnerability

Linux Kernel Race Condition Vulnerability

Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on 18 Sep 2026.

Reported by 4 independent sources · first reported 18 Sep 2026 by CERT-FR · last reported 22 Oct 2026

Last reported 2 days ago

CISA KEVAdded 18 Sep 2026
Fix due 21 Sep 2026
Used by ransomware: not knownCISA KEV catalogue

EPSS1.4%
higher than 71% of CVEsFIRST EPSS, as of 23 Oct 2026

What the reports say

11 reports, newest first · the exact sentence from each

“CVE-2025-39964”

CISA advisoriesGovernment22 Oct 2026
Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP
“Référence CVE CVE-2025-39964”

CERT-FRGovernment16 Oct 2026
Multiples vulnérabilités dans le noyau Linux de SUSE (16 octobre 2026)
“…795, CVE-2025-39826, CVE-2025-39827, CVE-2025-39845, CVE-2025-39866, CVE-2025-39871, CVE-2025-39931, CVE-2025-39953, CVE-2025-39955, CVE-2025-39964, CVE-2025-39977, CVE-2025-39978, CVE-2025-39980, CVE-2025-40022, CVE-2025-40070, CVE-2025-40078, CVE-2025-40080, CVE-2025-40105, CVE…”

CERT-FRGovernment13 Oct 2026
Multiples vulnérabilités dans les produits Siemens (13 octobre 2026)
“CVE-2025-39964”

Recorded FutureVendor13 Oct 2026
September 2026 CVE Landscape
“Référence CVE CVE-2025-39964”

CERT-FRGovernment2 Oct 2026
Multiples vulnérabilités dans le noyau Linux de Red Hat (02 octobre 2026)
“Référence CVE CVE-2025-39964”

CERT-FRGovernment25 Sep 2026
Multiples vulnérabilités dans le noyau Linux de Red Hat (25 septembre 2026)
“Référence CVE CVE-2025-39964”

CERT-FRGovernment25 Sep 2026
Multiples vulnérabilités dans le noyau Linux de SUSE (25 septembre 2026)
“CISA added three actively exploited Linux kernel vulnerabilities: CVE-2025-39682, CVE-2026-53266, and CVE-2025-39964 to its KEV Catalog on September 18, 2026, triggering a 3-day remediation deadline that passed on September 21.”

Qualys Threat ResearchVendor23 Sep 2026
CISA BOD 26-04 Timelines for Three Linux Kernel CVEs
“CVE-2025-39964”

CERT-FRGovernment21 Sep 2026
Bulletin d'actualité CERTFR-2026-ACT-040 (21 septembre 2026)
“CVE-2025-39964 Linux Kernel Race Condition Vulnerability”

CISA advisoriesGovernment18 Sep 2026
CISA Adds Two Known Exploited Vulnerabilities to Catalog
“Référence CVE CVE-2025-39964”

CERT-FRGovernment18 Sep 2026
Multiples vulnérabilités dans le noyau Linux de SUSE (18 septembre 2026)

Indicators reported together

named in the same reports

Also named with it: CVE-2026-53266, CVE-2025-39682, CVE-2026-87491, CVE-2026-63823, CVE-2026-68121, CVE-2026-68155, CVE-2026-68159, CVE-2026-52993, CVE-2026-53002, CVE-2026-53185, CVE-2026-64191, CVE-2026-76460, CVE-2026-76461, CVE-2026-58704, CVE-2026-87886, CVE-2023-54391, CVE-2026-68273, CVE-2026-74469, CVE-2025-40323, CVE-2026-46199

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