CVE-2026-92521

Service interruption via stale PCI root pointers

Published Sep 17, 2026 · Updated Sep 17, 2026

Use-after-free in Linux 2.6.28 ACPI PCI roots allows local users to interrupt service via failed hot-add or root removal. In drivers/acpi/pci_root.c, acpi_pci_root_add() and acpi_pci_root_remove() free root objects without clearing device->driver_data, leaving acpi_pci_find_root() able to dereference freed memory. Triggering requires a failed dmar_device_add() during hot-add or root removal followed by a lookup; the sources do not establish a specific crash mode.

CVSS severity1.9
Low
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 2.6.28 ACPI PCI roots allows local users to interrupt service via failed hot-add or root removal. In drivers/acpi/pci_root.c, acpi_pci_root_add() and acpi_pci_root_remove() free root objects without clearing device->driver_data, leaving acpi_pci_find_root() able to dereference freed memory. Triggering requires a failed dmar_device_add() during hot-add or root removal followed by a lookup; the sources do not establish a specific crash mode.

The record

CVE
CVE-2026-92521
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=2.6.28
  2. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <321bb0eb1486a0d575f02e24e3f4170e408c2f51
  3. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2
  4. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <3eee4c21931dc048ce63b86809f04e4e6f0dcad5
  5. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <6aaf6dbf54fdfae096f3f90a79e9614e46579280
  6. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217
  7. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <70cf773cca30a10b4964c24520a71279c974b899
  8. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <8a742141f7ab84975aa758b775567ef4740ef0cf
  9. Affected versionversion=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <a285fa3780c768dcc51c76768707d099a2cc611d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <321bb0eb1486a0d575f02e24e3f4170e408c2f51; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <3eee4c21931dc048ce63b86809f04e4e6f0dcad5; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <6aaf6dbf54fdfae096f3f90a79e9614e46579280; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <70cf773cca30a10b4964c24520a71279c974b899; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <8a742141f7ab84975aa758b775567ef4740ef0cf; version=db89b4f0dbab837d0f3de2c3e9427a8d5393afa3 <a285fa3780c768dcc51c76768707d099a2cc611d

Published CVSS scores

7.2TenableAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8TenableCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.9Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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