CVE-2025-39682

Published Sep 5, 2025

Last updated a month ago

CVSS high 7.1

Overview

Description
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 zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Analyzed
Products
linux_kernel, debian_linux

Risk scores

CVSS 3.1

Type
Primary
Base score
7.1
Impact score
5.2
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Severity
HIGH

Weaknesses

nvd@nist.gov
NVD-CWE-Other

Social media

Hype score
Not currently trending

  1. Critical #SUSE kernel patches released for CVE-2023-53676 (8.5), CVE-2025-39682 (7.0), and CVE-2025-40204 (8.7). Read more: šŸ‘‰ https://t.co/0JRU7UQyiA #Security https://t.co/4FhU1EHYHH

    @Cezar_H_Linux

    22 Jan 2026

    60 Impressions

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  2. CVE-2025-39682 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 ā€¦ https://t.co/OGtXRs6nyT

    @CVEnew

    6 Sept 2025

    383 Impressions

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.