PT-2026-39079 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-22 · CVE-2026-43418

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 race condition exists during concurrent fork operations where a newly forked task is accounted as an MMCID user before it becomes visible in the process thread list and the global task list. If preemption occurs, a subsequent mm cid fixup tasks to cpus() call may fail to identify the task, preventing the correct allocation of a CID (Context Identifier). This can lead to a failure in acquiring a transitional CID during scheduling, resulting in a system stall.

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

Related Identifiers

CVE-2026-43418

Affected Products

Linux Kernel

References · 12

• https://ubuntu.com/security/CVE-2026-43418 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43418 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43418 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-43418 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-43418 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43418 · Vendor Advisory
• https://git.kernel.org/linus/b2e48c429ec54715d16fefa719dd2fbded2e65be · Note
• https://t.me/cveNotify/164647 · Telegram Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://twitter.com/CVEnew/status/2052767658261832107 · Twitter Post
• https://git.kernel.org/stable/c/f0189d49282e0458f3a737bd486c1ec048148f66 · Note
• https://git.kernel.org/stable/c/b2e48c429ec54715d16fefa719dd2fbded2e65be · Note