CVE-2026-98163Hinoki check available

Local kernel panic via zero-refcount task resurrection

Published Sep 26, 2026 · Updated Sep 26, 2026

A use-after-free in the Linux 6.19 cgroup task iterator allows local users to trigger a kernel panic by reading cgroup.procs. Between css_task_iter_next() calls, a dying task can reach a zero usage count while remaining on dying_tasks, after which get_task_struct() resurrects it before free_task() releases it. Triggering the race requires local access to read cgroup.procs while a thread-group leader is reaped, and the demonstrated consequence is a host-wide panic.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A use-after-free in the Linux 6.19 cgroup task iterator allows local users to trigger a kernel panic by reading cgroup.procs. Between css_task_iter_next() calls, a dying task can reach a zero usage count while remaining on dying_tasks, after which get_task_struct() resurrects it before free_task() releases it. Triggering the race requires local access to read cgroup.procs while a thread-group leader is reaped, and the demonstrated consequence is a host-wide panic.

The record

CVE
CVE-2026-98163
Published
Sep 26, 2026
Updated
Sep 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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=260fbcb92bbeacfcd050410fdc2d24ab15044400 <057dac23d329d5c5ed62352f2659a39fd46c6d4a
  2. Affected versionversion=260fbcb92bbeacfcd050410fdc2d24ab15044400 <828938118d6c2bb711301748c3e39e4bed6a62f5
  3. Affected versionversion=6.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=260fbcb92bbeacfcd050410fdc2d24ab15044400 <057dac23d329d5c5ed62352f2659a39fd46c6d4a; version=260fbcb92bbeacfcd050410fdc2d24ab15044400 <828938118d6c2bb711301748c3e39e4bed6a62f5; version=6.19

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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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