CVE-2026-46196

Persistent syscall overhead via unmatched tracepoint registration

Published May 28, 2026 · Updated May 28, 2026

Resource-management error in Linux Kernel allows local users to impose persistent syscall tracing overhead under memory pressure. In tracepoint_add_func(), failed func_add() execution after ext->regfunc() returns without the matching ext->unregfunc(), retaining registration side effects with no probe installed. Exploitation requires local tracepoint access and an allocation failure; syscall tracing then remains enabled for every task until reboot.

CVSS severity5.5
Medium
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

Resource-management error in Linux Kernel allows local users to impose persistent syscall tracing overhead under memory pressure. In tracepoint_add_func(), failed func_add() execution after ext->regfunc() returns without the matching ext->unregfunc(), retaining registration side effects with no probe installed. Exploitation requires local tracepoint access and an allocation failure; syscall tracing then remains enabled for every task until reboot.

The record

CVE
CVE-2026-46196
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=4.10
  2. Affected versionversion=8cf868affdc459beee1a941df0cfaba1673740e3 <247ed8a969f981bfba3112fd4bb441eaa6cef59c
  3. Affected versionversion=8cf868affdc459beee1a941df0cfaba1673740e3 <2c5b8eeea006eb694c81631cd5713d494b80be90
  4. Affected versionversion=8cf868affdc459beee1a941df0cfaba1673740e3 <342829e042ac00f3d68d442ea92873fb6683f494
  5. Affected versionversion=8cf868affdc459beee1a941df0cfaba1673740e3 <7bcadb3c2bc1cf60690e931aadd35fb7bd646a49
  6. Affected versionversion=8cf868affdc459beee1a941df0cfaba1673740e3 <fad217e16fded7f3c09f8637b0f6a224d58b5f2e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.10; version=8cf868affdc459beee1a941df0cfaba1673740e3 <247ed8a969f981bfba3112fd4bb441eaa6cef59c; version=8cf868affdc459beee1a941df0cfaba1673740e3 <2c5b8eeea006eb694c81631cd5713d494b80be90; version=8cf868affdc459beee1a941df0cfaba1673740e3 <342829e042ac00f3d68d442ea92873fb6683f494; version=8cf868affdc459beee1a941df0cfaba1673740e3 <7bcadb3c2bc1cf60690e931aadd35fb7bd646a49; version=8cf868affdc459beee1a941df0cfaba1673740e3 <fad217e16fded7f3c09f8637b0f6a224d58b5f2e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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