CVE-2026-89771Hinoki check available

Inconsistent trace reads via subbuffer resize race

Published Sep 11, 2026 · Updated Sep 11, 2026

Race condition in the Linux kernel trace ring buffer allows local users to trigger inconsistent reads during concurrent subbuffer resizing. ring_buffer_read_page() and ring_buffer_read_start() read trace_buffer::subbuf_size without locking while ring_buffer_subbuf_order_set() can change it, so readers calculate capacity from stale size state. Only local users permitted to read and resize tracefs buffers can reach the race; the published record specifies no impact beyond inconsistent trace-buffer reads.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in the Linux kernel trace ring buffer allows local users to trigger inconsistent reads during concurrent subbuffer resizing. ring_buffer_read_page() and ring_buffer_read_start() read trace_buffer::subbuf_size without locking while ring_buffer_subbuf_order_set() can change it, so readers calculate capacity from stale size state. Only local users permitted to read and resize tracefs buffers can reach the race; the published record specifies no impact beyond inconsistent trace-buffer reads.

The record

CVE
CVE-2026-89771
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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 <0c7c517827a453128a8f58bfd849546a29813b27
  3. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <50f4a793c4ff24826efb0ac700989a5063cc53df
  4. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9
  5. Affected versionversion=f9b94daa542a8d2532f0930f01cd9aec2d19621b <8a5f63637890f03177146efddaba5ec7a1b4d61f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <0c7c517827a453128a8f58bfd849546a29813b27; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <50f4a793c4ff24826efb0ac700989a5063cc53df; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9; version=f9b94daa542a8d2532f0930f01cd9aec2d19621b <8a5f63637890f03177146efddaba5ec7a1b4d61f

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 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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