CVE-2025-39784 — Incorrect Initialization of Resource in Linux

CWE-1419 — Incorrect Initialization of Resource5 documents5 sources
Severity
5.5MEDIUMNVD
EPSS
0.0%
top 94.52%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
LinuxLinux KernelDebian Linux
Timeline
PublishedSep 11

Description

In the Linux kernel, the following vulnerability has been resolved: PCI: Fix link speed calculation on retrain failure When pcie_failed_link_retrain() fails to retrain, it tries to revert to the previous link speed. However it calculates that speed from the Link Control 2 register without masking out non-speed bits first. PCIE_LNKCTL2_TLS2SPEED() converts such incorrect values to PCI_SPEED_UNKNOWN (0xff), which in turn causes a WARN splat in pcie_set_target_speed(): pci 0000:00:01.1: [1022:1…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages4 packages

▶NVDlinux/linux_kernel6.13 — 6.16.4
▶Debianlinux/linux_kernel< 6.16.5-1
▶CVEListV5linux/linuxde9a6c8d5dbfedb5eb3722c822da0490f6a59a45 — 16557320f378262b5c605b15edebd3642406992a+2
▶debiandebian/linux< linux 6.16.5-1 (forky)

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-4mj4-9wgf-mxj5: In the Linux kernel, the following vulnerability has been resolved: PCI: Fix link speed calculation on retrain failure When pcie_failed_link_retrain↗2025-09-11
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OSV
CVE-2025-39784: In the Linux kernel, the following vulnerability has been resolved: PCI: Fix link speed calculation on retrain failure When pcie_failed_link_retrain()↗2025-09-11
▶

📋Vendor Advisories

2
Red Hat
kernel: Linux kernel: PCI link speed calculation DoS↗2025-09-11
▶
Debian
CVE-2025-39784: linux - In the Linux kernel, the following vulnerability has been resolved: PCI: Fix li...↗2025
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CVE-2025-39784 — Incorrect Initialization of Resource | cvebase