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INCIDENT 608Exploited vulnerabilityHIGH CONFIDENCESourced
CVE-2025-39964 added to CISA KEV: Linux Kernel Race Condition Vulnerability
<p>CISA has added two new vulnerabilities to its <a href="https://www.cisa.gov/known-exploited-vulnerabilities-catalog">Known Exploited Vulnerabilities (KEV) Catalog</a>, based on evidence of active exploitation.</p> <ul> <li><a href="https://www.cve.org/CVERecord?id=CVE-2025-39964" target="_blank">CVE-2025-39964</a> Linux Kernel Race Condition Vulnerability</li> <li><a href="https://www.cve.org/CVERecord?id=CVE-2026-53266" target="_blank">CVE-2026-53266</a> Linux Kernel Out-of-Bounds Write Vulnerability</li> </ul> <p>These types of vulnerabilities are a frequent attack vector for malicious c…
Last evidence update
18 SEP 2026 · 12:00 UTC
Source count
8
Status
high confidence
LogisticsGovernmentCVE-2025-39964CVE-2026-53266CVE-2025-39682
Observation history
How this record has evolved as evidence accumulated.
19 SEP · 05:22 UTC
Initial report
19 SEP · 05:22 UTC
Second independent source
19 SEP · 05:22 UTC
Related CVE identified (CVE-2026-53266)
19 SEP · 05:22 UTC
Second independent source
19 SEP · 05:22 UTC
Related CVE identified (CVE-2025-39682)
19 SEP · 05:22 UTC
Second independent source
19 SEP · 05:22 UTC
Confidence upgraded
19 SEP · 05:22 UTC
Status changed
19 SEP · 05:22 UTC
Second independent source
19 SEP · 05:22 UTC
Second independent source
19 SEP · 05:22 UTC
Summary updated from new evidence
19 SEP · 05:22 UTC
Second independent source
20 SEP · 05:22 UTC
Second independent source
Evidence
NVD · primary
CVE-2025-39682 (CRITICAL)
NVD · primary
CVE-2025-39964 (HIGH)
NVD · primary
CVE-2026-53266 (HIGH)
CISA KEV · high
CVE-2025-39682 added to CISA KEV: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
CISA KEV · high
CVE-2026-53266 added to CISA KEV: Linux Kernel Out-of-Bounds Write Vulnerability
CISA KEV · high
CVE-2025-39964 added to CISA KEV: Linux Kernel Race Condition Vulnerability
CISA · high
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA · high
CISA Adds One Known Exploited Vulnerability to Catalog