PT-2026-39053 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43392

Positive Technologies (AI Summary)

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

Description An issue exists in the sched ext component where the scx enable() function can suffer from starvation during the READY to ENABLED task switching loop. This occurs because the calling thread's scheduling class changes from fair to ext; since the fair class has higher priority, workloads saturating the fair class can indefinitely starve the enable thread, leading to a system hang. This condition was introduced when the enable path transitioned from preempt disable() to scx bypass(), as the latter does not protect against fair-class starvation.

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

Related Identifiers

CVE-2026-43392

Affected Products

Linux Kernel

References · 14

• https://cve.org/CVERecord?id=CVE-2026-43392 · Security Note
• https://ubuntu.com/security/CVE-2026-43392 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43392 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43392 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43392 · Vendor Advisory
• https://git.kernel.org/stable/c/05ab9ec5dc24f234e0a2fecf3e6ff937c68f7d81 · Note
• https://git.kernel.org/stable/c/c44198f25fdfecc0ec0fe366bf8a47fe17d8e229 · Note
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://git.kernel.org/linus/b06ccbabe2506fd70b9167a644978b049150224a · Note
• https://git.kernel.org/stable/c/b06ccbabe2506fd70b9167a644978b049150224a · Note
• https://twitter.com/infoflowcloud/status/2052769619056693578 · Twitter Post
• https://twitter.com/CVEnew/status/2052767691094839735 · Twitter Post
• https://git.kernel.org/stable/c/e0b14bf06393be137d3efb6a3b7cd5b4b9810a6b · Note