CVE-2026-80896

Unspecified impact via concurrent irqfd deactivation

Published Sep 4, 2026 · Updated Sep 4, 2026

Race condition in the mshv irqfd component of Linux 6.15 and later allows local users to trigger unspecified impact during deassignment. mshv_irqfd_deassign() traverses pt_irqfds_list without pt_irqfds_lock, while hlist_del() leaves poisoned pointers that pass the active-node guard and permit a second deletion. Reaching the race requires concurrent deassignment and EPOLLHUP handling for the same irqfd; Linux has not published the resulting impact.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
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 the mshv irqfd component of Linux 6.15 and later allows local users to trigger unspecified impact during deassignment. mshv_irqfd_deassign() traverses pt_irqfds_list without pt_irqfds_lock, while hlist_del() leaves poisoned pointers that pass the active-node guard and permit a second deletion. Reaching the race requires concurrent deassignment and EPOLLHUP handling for the same irqfd; Linux has not published the resulting impact.

The record

CVE
CVE-2026-80896
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.15
  2. Affected versionversion=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <0762262ac3e70f65b3bb843fe892f8bac1562d08
  3. Affected versionversion=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <4529a41a675b96e0f876eef1cc93a31a57cb4d18
  4. Affected versionversion=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <72a90ce4918b5a2d4820fe20677ba9af780d8826

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <0762262ac3e70f65b3bb843fe892f8bac1562d08; version=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <4529a41a675b96e0f876eef1cc93a31a57cb4d18; version=621191d709b14882270dfd8ea5d7d6cdfebe2c35 <72a90ce4918b5a2d4820fe20677ba9af780d8826

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

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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