PT-2026-34386 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-04-28 · CVE-2026-31481

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 in the tracing component occurs when boot-time trigger registration fails before the trigger-data cleanup kthread is created. If kthread creation fails, the system fails to drain the deferred free list, causing boot-deferred nodes to accumulate on the trigger data free list. Subsequent free operations then only synchronously free the current object, leading to a permanent leak of older queued entries. This condition can result in a NULL pointer dereference and a kernel crash.

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

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-31481

Affected Products

Linux Kernel

References · 11

• https://security-tracker.debian.org/tracker/CVE-2026-31481 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31481 · Vendor Advisory
• https://git.kernel.org/stable/c/771624b7884a83bb9f922ae64ee41a5f8b7576c9 · Patch
• https://git.kernel.org/stable/c/250ab25391edeeab8462b68be42e4904506c409c · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31481 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31481 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31481 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31481 · Security Note
• https://git.kernel.org/linus/250ab25391edeeab8462b68be42e4904506c409c · Note
• https://t.me/cveNotify/161235 · Telegram Post
• https://twitter.com/CVEnew/status/2046980000906105043 · Twitter Post