CVE-2026-80645

Kernel crash via stale doorbell iterator dereference

Published Aug 28, 2026 · Updated Aug 28, 2026

Invalid pointer dereference in the Linux Tsi721 RapidIO driver allows attackers to crash the kernel during doorbell processing. In tsi721_db_dpc(), found is not reset for each doorbell, so a later list miss remains marked found and the expired dbell iterator is dereferenced. Reachability requires the Tsi721 driver, compatible bridge hardware, and doorbell processing on a RapidIO fabric.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
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

Invalid pointer dereference in the Linux Tsi721 RapidIO driver allows attackers to crash the kernel during doorbell processing. In tsi721_db_dpc(), found is not reset for each doorbell, so a later list miss remains marked found and the expired dbell iterator is dereferenced. Reachability requires the Tsi721 driver, compatible bridge hardware, and doorbell processing on a RapidIO fabric.

The record

CVE
CVE-2026-80645
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
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=3.2
  2. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <070f356ea4f419e4e85e4089381f4477f41d969e
  3. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <13092966ba5d8fb214a4efeddc87f9ed0fd2f945
  4. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <3b5c66e922aa6a3331915a14520848a5b3beccc7
  5. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43
  6. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <9e775c3199903d7c09a52530042b1198eab705bd
  7. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <acd54f42abbbd806464468838dbc04efd203d2be
  8. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <dc28a14f3e4546b2b06098d24177942540581a5f
  9. Affected versionversion=48618fb4e522d9d02e217ac05f52749545c1af20 <fc15e3a30ddd950f009c76765331783b9af94a87

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=48618fb4e522d9d02e217ac05f52749545c1af20 <070f356ea4f419e4e85e4089381f4477f41d969e; version=48618fb4e522d9d02e217ac05f52749545c1af20 <13092966ba5d8fb214a4efeddc87f9ed0fd2f945; version=48618fb4e522d9d02e217ac05f52749545c1af20 <3b5c66e922aa6a3331915a14520848a5b3beccc7; version=48618fb4e522d9d02e217ac05f52749545c1af20 <81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43; version=48618fb4e522d9d02e217ac05f52749545c1af20 <9e775c3199903d7c09a52530042b1198eab705bd; version=48618fb4e522d9d02e217ac05f52749545c1af20 <acd54f42abbbd806464468838dbc04efd203d2be; version=48618fb4e522d9d02e217ac05f52749545c1af20 <dc28a14f3e4546b2b06098d24177942540581a5f; version=48618fb4e522d9d02e217ac05f52749545c1af20 <fc15e3a30ddd950f009c76765331783b9af94a87

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)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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