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Review reviewHigh

CVE-2025-39682

Linux Linux, SIMATIC CN 4100, linux kernel

In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zer...

CVSS
7.1
EPSS
0.47%
38.3% percentile
CISA KEV
Not listed
Published
2025.09.06
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.47%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zer...

Affected product and versions

Product
Linux Linux, SIMATIC CN 4100, linux kernel
Affected versions
>= 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 2902c3ebcca52ca845c03182000e8d71d3a5196f, >= 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677, >= 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 3439c15ae91a517cf3c650ea15a8987699416ad9, >= 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e, >= 84c61fe1a75b4255df1e1e7c054c9e6d048da417 < 62708b9452f8eb77513115b17c4f8d1a22ebf843, >= 6.0, < V5.0, >= 6.0 < 6.1.149, >= 6.2 < 6.6.103, >= 6.7 < 6.12.44, >= 6.13 < 6.16.4, 6.17, 11.0
Fixed versions
6.1.149, 6.6.103, 6.12.44, 6.16.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC CN 4100, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
Not available
CVE-2025-39682 — Linux Linux, SIMATIC CN 4100, linux kernel | SECUFOCUS NOW