PT-2026-34893 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-04-29 · CVE-2026-31541

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Description A Use-After-Free (UAF) issue exists in the tracing component. When the copy trace marker option is enabled, data written to '/sys/kernel/tracing/trace marker' is copied into the instance buffer, and the trace array descriptor is added to the marker copies link list protected by RCU. During instance deletion, flags are cleared before calling update marker trace(). Because the flag is already cleared, update marker trace() returns false, preventing synchronize rcu() from being called and leaving the system susceptible to a UAF bug.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2026-31541

Affected Products

Linux Kernel

References · 12

• https://cve.org/CVERecord?id=CVE-2026-31541 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31541 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31541 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31541 · Vendor Advisory
• https://git.kernel.org/stable/c/cc267e4b4302247dc67ef937a9ac587a696a43c1 · Patch
• https://git.kernel.org/stable/c/07183aac4a6828e474f00b37c9d795d0d99e18a7 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31541 · Security Note
• https://git.kernel.org/stable/c/75668e58244e63ec3785098a02e1cdcff14a6c2e · Patch
• https://ubuntu.com/security/CVE-2026-31541 · Vendor Advisory
• https://twitter.com/CVEnew/status/2047798643999302139 · Twitter Post
• https://twitter.com/infoflowcloud/status/2047799463003992358 · Twitter Post
• https://git.kernel.org/linus/07183aac4a6828e474f00b37c9d795d0d99e18a7 · Note