VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-92521: Linux kernel · ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in a285fa3780c768dcc51c76768707d099a2cc611d : patch Linux kernel soon.

Data as of 26 Oct 2026, 17:16 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in a285fa3780c768dcc51c76768707d099a2cc611d, 321bb0eb1486a0d575f02e24e3f4170e408c2f51, 70cf773cca30a10b4964c24520a71279c974b899 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < a285fa3780c768dcc51c76768707d099a2cc611d	Fixed in a285fa3780c768dcc51c76768707d099a2cc611d
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 321bb0eb1486a0d575f02e24e3f4170e408c2f51	Fixed in 321bb0eb1486a0d575f02e24e3f4170e408c2f51
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 70cf773cca30a10b4964c24520a71279c974b899	Fixed in 70cf773cca30a10b4964c24520a71279c974b899
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 8a742141f7ab84975aa758b775567ef4740ef0cf	Fixed in 8a742141f7ab84975aa758b775567ef4740ef0cf
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217	Fixed in 6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217
LinuxLinux	Affected ≥ db89b4f0dbab837d0f3de2c3e9427a8d5393afa3, < 6aaf6dbf54fdfae096f3f90a79e9614e46579280	Fixed in 6aaf6dbf54fdfae096f3f90a79e9614e46579280

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update their Linux kernel to a version including these fixes to mitigate the vulnerability.

Description

A use-after-free vulnerability in the Linux kernel's ACPI PCI subsystem was fixed by ensuring that driver_data pointers are cleared on all code paths that free the acpi_pci_root object. Previously, failure paths in acpi_pci_root_add() and acpi_pci_root_remove() could leave dangling pointers, potentially leading to invalid memory access.

Impact

This vulnerability could lead to use-after-free conditions in the kernel, which may cause system instability or potentially allow attackers to execute arbitrary code or escalate privileges if exploited. However, no known exploits in the wild have been reported.

Summary

The Linux kernel ACPI PCI code had a flaw where device->driver_data was not cleared on all paths that free the acpi_pci_root structure. Specifically, if dmar_device_add() failed during a hot-add, the root was freed but driver_data still pointed to the freed memory, leaving a dangling pointer. Similarly, acpi_pci_root_remove() freed the root without clearing driver_data. The fix moves the NULL assignment of driver_data to a shared error handling label so that all failure paths clear driver_data before freeing root, preventing use-after-free conditions.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 15:18 UTC

Technical details

References

Community reviews

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