CVE-2025-39682

Katalog CVE

CVSS 9.8 · Critical KEV · sudah dieksploitasi EPSS 2,9%

Kerentanan Improper Check for Unusual or Exceptional Conditions pada linux kernel, debian linux +1 lainnya. Skor CVSS 3.1 9.8 (Critical) menurut NVD. Masuk katalog KEV CISA pada 18 September 2026, artinya sudah terbukti dieksploitasi.

Deskripsi (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.

Advisory KUTIM-CSIRT

• Peringatan Keamanan: 5 Kerentanan Kernel Linux Dieksploitasi Aktif, Masuk Katalog KEV CISA 19 Sep 2026

Rincian

Terbit di NVD

5 September 2025

Terakhir diubah

7 Oktober 2026

Status NVD

Analyzed

CVSS 3.1

9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-754: Improper Check for Unusual or Exceptional Conditions

EPSS (30 hari)

2,9% peluang dieksploitasi; lebih tinggi dari 86,5% CVE lain

Known Exploited Vulnerabilities (CISA)

Nama

Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability

Masuk KEV

18 September 2026

Tenggat CISA

21 September 2026 (untuk instansi federal AS)

Ransomware

Belum tercatat

Tindakan wajib

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.

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/2902c3ebcca52ca845c03182000e8d71d3a5196f patch
• https://git.kernel.org/stable/c/29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e patch
• https://git.kernel.org/stable/c/3439c15ae91a517cf3c650ea15a8987699416ad9 patch
• https://git.kernel.org/stable/c/62708b9452f8eb77513115b17c4f8d1a22ebf843 patch
• https://git.kernel.org/stable/c/c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677 patch
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-39682 pemerintah AS
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html mailing list · advisory pihak ketiga
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html advisory pihak ketiga