CVE-2026-89501

Kernel memory corruption via unlocked sub-buffer resizing

Published Sep 11, 2026 · Updated Sep 11, 2026

Race condition in Linux 6.8 allows attackers to corrupt kernel memory by concurrently resizing and reading trace ring-buffer sub-buffers. In ring_buffer_subbuf_order_set(), the code clears cpu_buffer->free_page without holding cpu_buffer->lock, allowing read-page paths to replace the page between the saved-order read and the clear. Reachability requires concurrent sub-buffer resizing and read-page activity; the stale page and order can produce an oversized copy or corrupt the page allocator.

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

What happened

Race condition in Linux 6.8 allows attackers to corrupt kernel memory by concurrently resizing and reading trace ring-buffer sub-buffers. In ring_buffer_subbuf_order_set(), the code clears cpu_buffer->free_page without holding cpu_buffer->lock, allowing read-page paths to replace the page between the saved-order read and the clear. Reachability requires concurrent sub-buffer resizing and read-page activity; the stale page and order can produce an oversized copy or corrupt the page allocator.

The record

CVE
CVE-2026-89501
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=8e7b58c27b3c567316a51079b375b846f9223bba <24974bd0da1b47fd56c975533ead50abf754e74d
  3. Affected versionversion=8e7b58c27b3c567316a51079b375b846f9223bba <6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2
  4. Affected versionversion=8e7b58c27b3c567316a51079b375b846f9223bba <8a496aaa3da6e8d545896c2370c7e617cc931ae2
  5. Affected versionversion=8e7b58c27b3c567316a51079b375b846f9223bba <bf242baf58de03467f226c8e29554c9495dca7fc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=8e7b58c27b3c567316a51079b375b846f9223bba <24974bd0da1b47fd56c975533ead50abf754e74d; version=8e7b58c27b3c567316a51079b375b846f9223bba <6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2; version=8e7b58c27b3c567316a51079b375b846f9223bba <8a496aaa3da6e8d545896c2370c7e617cc931ae2; version=8e7b58c27b3c567316a51079b375b846f9223bba <bf242baf58de03467f226c8e29554c9495dca7fc

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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