CVE-2026-89747Public exploit

Kernel crash via trace_pipe resize race

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in Linux 6.8 allows local users with tracefs write access to crash the kernel by racing trace_pipe reads with sub-buffer resizing. ring_buffer_peek returns an event pointer after releasing reader_lock, while buffer_subbuf_size_kb can free and replace the referenced reader page. Exploitation requires local access to read trace_pipe and write the tracefs sizing control; the demonstrated consequence is a kernel fault and service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux 6.8 allows local users with tracefs write access to crash the kernel by racing trace_pipe reads with sub-buffer resizing. ring_buffer_peek returns an event pointer after releasing reader_lock, while buffer_subbuf_size_kb can free and replace the referenced reader page. Exploitation requires local access to read trace_pipe and write the tracefs sizing control; the demonstrated consequence is a kernel fault and service interruption.

The record

CVE
CVE-2026-89747
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=6.8
  2. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <05ebe1e1d7d38c2612bacfefe043a33572ae34cb
  3. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <372f8534244d632ad5118e8a87a11291b01712d3
  4. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <7a49d19ff9baaf61217e5ec14199c18bc2d93ee4
  5. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <ddbe921ed16a0ad2d9e09574c3f3aabec7528325

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <05ebe1e1d7d38c2612bacfefe043a33572ae34cb; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <372f8534244d632ad5118e8a87a11291b01712d3; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <7a49d19ff9baaf61217e5ec14199c18bc2d93ee4; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <ddbe921ed16a0ad2d9e09574c3f3aabec7528325

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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