PT-2026-39046 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43385

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/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 An issue exists in the networking subsystem where enabling threaded busypoll can lead to an rcu tasks stall. This occurs because the last qs value is reset to the latest jiffies each time the napi threaded poll loop() function is called, preventing rcu softirq qs periodic from reporting its quiescent state. In threaded busypoll, the main loop resides in napi threaded poll() rather than napi threaded poll loop(), which rarely iterates more than once, causing the required 100ms delay for state reporting to never be reached.

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

Related Identifiers

CVE-2026-43385

Affected Products

Linux Kernel

References · 12

• https://ubuntu.com/security/CVE-2026-43385 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43385 · Vendor Advisory
• https://git.kernel.org/stable/c/52459201d0df3fdbb1d281738b7b772e2cacb49c · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43385 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43385 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43385 · Security Note
• https://git.kernel.org/stable/c/1a86a1f7d88996085934139fa4c063b6299a2dd3 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43385 · Vendor Advisory
• https://twitter.com/CVEnew/status/2052767699961549038 · Twitter Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://git.kernel.org/linus/1a86a1f7d88996085934139fa4c063b6299a2dd3 · Note
• https://twitter.com/infoflowcloud/status/2052769684773101570 · Twitter Post