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CVEs Live

CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability

Linux · Kernel

Listed by CISA as exploited in the wild since 18 Sep 2026. Below: exploitation status, EPSS and every published CVSS, each with its source, then affected versions and references.

Build snapshot collected · KEV catalog 2026.10.02 · EPSS of 2 Oct 2026 · not a live feed: collected once, at build time

Description

as written by CISA (KEV catalog)

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 KEV

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.

Affected products and versions

CVE record · Linux

  • Linux · Linux

    • affected: from 84c61fe1a75b4255df1e1e7c054c9e6d048da417 before 2902c3ebcca52ca845c03182000e8d71d3a5196f
    • affected: from 84c61fe1a75b4255df1e1e7c054c9e6d048da417 before c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677
    • affected: from 84c61fe1a75b4255df1e1e7c054c9e6d048da417 before 3439c15ae91a517cf3c650ea15a8987699416ad9
    • affected: from 84c61fe1a75b4255df1e1e7c054c9e6d048da417 before 29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e
    • affected: from 84c61fe1a75b4255df1e1e7c054c9e6d048da417 before 62708b9452f8eb77513115b17c4f8d1a22ebf843

  • Linux · Linux

    • affected: 6.0
    • unaffected: before 6.0
    • unaffected: from 6.1.149 through 6.1.*
    • unaffected: from 6.6.103 through 6.6.*
    • unaffected: from 6.12.44 through 6.12.*
    • unaffected: from 6.16.4 through 6.16.*
    • unaffected: from 6.17 through *

Status words (affected, unaffected, unknown) and version bounds are copied from the record. An upper bound such as “before 7.1.0” usually marks the first fixed version; confirm in the vendor advisory before planning an upgrade.

References

CISA KEV notes and CVE record

EPSS over the last 30 days

See also: all Linux entries in KEV · the full KEV catalog

Related entries

Other Linux entries in KEV

Added in the same week (see the week)

Questions about CVE-2025-39682

Is CVE-2025-39682 being exploited?

Yes, according to CISA. CVE-2025-39682 was added to the Known Exploited Vulnerabilities catalog on 18 Sep 2026, which CISA does only with reliable evidence of exploitation in the wild. The catalog field for ransomware campaign use says "Unknown".

What is the deadline to remediate CVE-2025-39682?

CISA set 21 Sep 2026 as the due date for US Federal Civilian Executive Branch agencies. The date is binding only for those agencies; other organisations can read it as a measure of urgency.

What is the EPSS score of CVE-2025-39682?

2.88%, in the 86th percentile, in the FIRST EPSS model of 2 Oct 2026. It estimates the probability of exploitation activity in the following 30 days. For a CVE already in KEV the score is secondary: exploitation has been observed.

How severe is CVE-2025-39682?

NVD rates it 9.8 CRITICAL (CVSS 3.1); 416baaa9-dc9f-4396-8d5f-8c081fb06d67 rates it 9.8 CRITICAL (CVSS 3.1). These are the published assessments as of 3 Oct 2026; this site does not rescore.

Which product does CVE-2025-39682 affect?

Linux Kernel, as named in the CISA catalog. The affected versions listed in the CVE record are on this page; the vendor advisory in the references is the authority on fixed versions.

Related sections