CVE-2026-80689

System crash via absent mmiotrace array

Published Aug 28, 2026 · Updated Aug 28, 2026

NULL pointer dereference in Linux kernel mmiotrace allows local users to crash the system when logging uses an absent trace array. __trace_mmiotrace_rw() and __trace_mmiotrace_map() dereference tr->array_buffer.buffer without checking whether mmio_trace_array supplied a non-NULL array. Reaching the condition requires local mmiotrace access and a logging call before initialization or after the tracer is disabled.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux kernel mmiotrace allows local users to crash the system when logging uses an absent trace array. __trace_mmiotrace_rw() and __trace_mmiotrace_map() dereference tr->array_buffer.buffer without checking whether mmio_trace_array supplied a non-NULL array. Reaching the condition requires local mmiotrace access and a logging call before initialization or after the tracer is disabled.

The record

CVE
CVE-2026-80689
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=2.6.27
  2. Affected versionversion=f984b51e0779a6dd30feedc41404013ca54e5d05 <12b80cdbc54cf615b4717a4e8180063408091ea2
  3. Affected versionversion=f984b51e0779a6dd30feedc41404013ca54e5d05 <60234845142fddb27db89ebc00a65178421fb3a4
  4. Affected versionversion=f984b51e0779a6dd30feedc41404013ca54e5d05 <876014b4eeb927146430e7591cf959a7ceb8d64a
  5. Affected versionversion=f984b51e0779a6dd30feedc41404013ca54e5d05 <a20a0010eb6485f60cd64e15ebc85a4bd388642e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=f984b51e0779a6dd30feedc41404013ca54e5d05 <12b80cdbc54cf615b4717a4e8180063408091ea2; version=f984b51e0779a6dd30feedc41404013ca54e5d05 <60234845142fddb27db89ebc00a65178421fb3a4; version=f984b51e0779a6dd30feedc41404013ca54e5d05 <876014b4eeb927146430e7591cf959a7ceb8d64a; version=f984b51e0779a6dd30feedc41404013ca54e5d05 <a20a0010eb6485f60cd64e15ebc85a4bd388642e

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 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

T1499Endpoint Denial of Service

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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