CVE-2026-31541

Unspecified impact via skipped RCU synchronization

Published Apr 24, 2026 · Updated Apr 24, 2026

Use-after-free in Linux Kernel 6.16 through 6.19.9 allows local users with CAP_SYS_ADMIN to cause unspecified impact during trace-instance deletion. During teardown, kernel/trace/trace.c clears copy_trace_marker before update_marker_trace() checks for a state change, so synchronize_rcu() is skipped while readers can retain the removed trace_array descriptor. Exploitation requires root or CAP_SYS_ADMIN access to tracefs, creation and removal of a tracing instance, and use of copy_trace_marker; no narrower consequence has been published.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel 6.16 through 6.19.9 allows local users with CAP_SYS_ADMIN to cause unspecified impact during trace-instance deletion. During teardown, kernel/trace/trace.c clears copy_trace_marker before update_marker_trace() checks for a state change, so synchronize_rcu() is skipped while readers can retain the removed trace_array descriptor. Exploitation requires root or CAP_SYS_ADMIN access to tracefs, creation and removal of a tracing instance, and use of copy_trace_marker; no narrower consequence has been published.

The record

CVE
CVE-2026-31541
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.16
  2. Affected versionversion=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <07183aac4a6828e474f00b37c9d795d0d99e18a7
  3. Affected versionversion=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <75668e58244e63ec3785098a02e1cdcff14a6c2e
  4. Affected versionversion=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <cc267e4b4302247dc67ef937a9ac587a696a43c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <07183aac4a6828e474f00b37c9d795d0d99e18a7; version=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <75668e58244e63ec3785098a02e1cdcff14a6c2e; version=7b382efd5e8af4c0c67e70ad3fb599dcd2dc0b86 <cc267e4b4302247dc67ef937a9ac587a696a43c1

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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