CVE-2026-80876

Incorrect ftrace event lengths via alignment miscalculation

Published Sep 4, 2026 · Updated Sep 4, 2026

Incorrect length reporting in affected Linux stable branches causes small ftrace ring-buffer events to report four extra data bytes. The ring_buffer_event_length() path fails to subtract the event->array[0] length field for small events when RB_FORCE_8BYTE_ALIGNMENT is enabled. The condition was observed on riscv64 with CONFIG_HAVE_64BIT_ALIGNED_ACCESS enabled, and the published record identifies no consequence beyond incorrect payload-length reporting.

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

Incorrect length reporting in affected Linux stable branches causes small ftrace ring-buffer events to report four extra data bytes. The ring_buffer_event_length() path fails to subtract the event->array[0] length field for small events when RB_FORCE_8BYTE_ALIGNMENT is enabled. The condition was observed on riscv64 with CONFIG_HAVE_64BIT_ALIGNED_ACCESS enabled, and the published record identifies no consequence beyond incorrect payload-length reporting.

The record

CVE
CVE-2026-80876
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

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  1. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <14057268e79654c3e8ea2c9b5204cb9644b2964d
  2. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <24c3fa71f9947b0e1f3b954db1b769b44140192e
  3. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <3a63a11897c7ba32d1be7a3fdbc48a8b01cf4992
  4. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <7c9f0ccf9f04142458d2ac3d39414f4acae242f0
  5. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <c37e0a4b79a6bbb96ce5ffe279d7c001e20529e0
  6. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <cfada73fabe2ccc06ec77fe2ceaa088689213326
  7. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <dbcb8635b1eb7603818591cf745c7b1d714f7ac6
  8. Affected versionversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <ec5e96aee75d27779b9a860307679f13f33adb0c
  9. Affected versionversion=2.6.34

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2271048d1b3b0aabf83d25b29c20646dcabedc05 <14057268e79654c3e8ea2c9b5204cb9644b2964d; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <24c3fa71f9947b0e1f3b954db1b769b44140192e; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <3a63a11897c7ba32d1be7a3fdbc48a8b01cf4992; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <7c9f0ccf9f04142458d2ac3d39414f4acae242f0; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <c37e0a4b79a6bbb96ce5ffe279d7c001e20529e0; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <cfada73fabe2ccc06ec77fe2ceaa088689213326; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <dbcb8635b1eb7603818591cf745c7b1d714f7ac6; version=2271048d1b3b0aabf83d25b29c20646dcabedc05 <ec5e96aee75d27779b9a860307679f13f33adb0c; version=2.6.34

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

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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)
VectorUnavailable
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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