LIVE · cybersecurity feed
Live wire
ASOS Breach Reveals the Risks in Customer-Facing SaaSUnpatched AhsayCBS flaws exploited to deploy webshells, mine cryptoAI Training Critical as Governance Challenges GrowUS Disrupts Chinese State-Sponsored Hacking ToolsCitrix warns admins to patch new NetScaler RCE flaw immediatelyCisco Patches a Dozen Critical VulnerabilitiesCisco warns of critical flaws allowing Nexus switch takeoverCVE-2026-21589 · Exploitation attempts against critical Atlassian flaw have begun (CVE-2026-21589)Cyber experts call on CISA to create mandatory federal OT rulesGremlin Foresight AI finds system weaknesses and verifies the fixes
cve recordhighexploited in the wild3 of 3 cataloguesexploit reported

CVE-2025-39682

Linux · Kernel · Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS3.3%88.4th percentile
Exploited3 KEV sources
Ransomware useUnknown
Federal fix dueSep 21, 2026
patch window

Called exploited 378 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE reserved
  2. CVE published5mo
  3. First KEV listing1.0y
  4. Last sightingsame day

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by0 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

1 public report collected from VulnCheck and CIRCL, first on Sep 18, 2026. Each links to its original source. We have not verified them.

Description

Linux Kernel contains an improper check for unusual or exceptional conditions vulnerability in the TLS receive path which allows a zero-length record retrieved from the rx_list to bypass the intended recvmsg() record-type handling, potentially causing subsequent TLS records to be processed using incorrect zero-copy and queuing assumptions. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.

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.

References

← Back to the CVE Tracker

Our coverage of CVE-2025-39682

CVE-2025-39682high

CISA Flags Three Linux Kernel Vulnerabilities Exploited in the Wild

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added three Linux kernel vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, indicating that these flaws are being actively exploited in the wild. This advisory highlights the immediate threat posed by these specific kernel issues to systems running the Linux operating system.