CVE-2025-39682: Linux Kernel TLS İşleme Açığı (CVE-2025-39682)

Linux Kernel'deki TLS işleme hatası, özel veri paketleriyle istismar edilebilir. Saldırgan, sistemde yetkisiz erişim veya hizmet reddi yapabilir. Hemen en güncel Linux Kernel yamalarını uygulayarak bu açığı kapatın.

Türkçe özet yapay zekâ ile üretildi.

Açıklama (NVD)

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.

Özet bilgiler

Ürün

Linux Linux Kernel

CVSS v3.1

9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

%3,20 (yüzdelik 88)

CWE

CWE-754

Yama

Mevcut

KEV

Eklenme: 2026-09-18 · Son tarih: 2026-09-21

Gerekli aksiyon: 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.

Etkilenen sürümler

Kaynaklar

• NVD kaydı
• git.kernel.org
• git.kernel.org
• git.kernel.org
• git.kernel.org
• git.kernel.org
• lists.debian.org
• cert-portal.siemens.com
• www.cisa.gov
• CWE-754
• CISA KEV kataloğu