PT-2025-37241 · Linux+1 · Linux Kernel+1

Lukas · Published 2025-06-24 · Updated 2025-11-25 · CVE-2025-39784

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)

Description: A flaw exists in the Linux kernel related to PCI link speed calculation during retrain failures. Specifically, when pcie failed link retrain() fails to retrain a link, it attempts to revert to the previous link speed. However, the calculation of this speed from the Link Control 2 register does not properly mask out non-speed bits, leading to an incorrect speed value being determined as PCI SPEED UNKNOWN (0xff). This results in a warning message and potential issues with downstream link functionality. The issue occurs due to an incorrect conversion of values in PCIE LNKCTL2 TLS2SPEED() and PCIE LNKCAP SLS2SPEED().

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-1419

Related Identifiers

BDU:2026-06108

CVE-2025-39784

Affected Products

Astra Linux

Linux Kernel

References · 17

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39784.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2025-39784 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39784 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39784 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39784 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06108 · Security Note
• https://git.kernel.org/stable/c/16557320f378262b5c605b15edebd3642406992a · Patch
• https://ubuntu.com/security/CVE-2025-39784 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39784 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39784 · Security Note
• https://git.kernel.org/stable/c/9989e0ca7462c62f93dbc62f684448aa2efb9226 · Patch
• https://git.kernel.org/linus/9989e0ca7462c62f93dbc62f684448aa2efb9226 · Note
• https://t.me/cveNotify/143992 · Telegram Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.16.4 · Note