CVE-2023-52766

Kernel memory corruption via unallocated ring headers

Published May 21, 2024 · Updated Aug 5, 2026

Out-of-bounds access in the Linux kernel MIPI I3C HCI driver allows local users to corrupt kernel memory through I3C/I2C bus traffic. The hci_dma_irq_handler function iterates interrupt bits beyond the ring headers allocated and enabled by hci_dma_init, then dereferences rings->headers[i]. On multi-ring-capable I3C HCI hardware, low-privileged local bus transfers can trigger kernel memory disclosure, corruption, or a panic without user interaction.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel MIPI I3C HCI driver allows local users to corrupt kernel memory through I3C/I2C bus traffic. The hci_dma_irq_handler function iterates interrupt bits beyond the ring headers allocated and enabled by hci_dma_init, then dereferences rings->headers[i]. On multi-ring-capable I3C HCI hardware, low-privileged local bus transfers can trigger kernel memory disclosure, corruption, or a panic without user interaction.

The record

CVE
CVE-2023-52766
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1068, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <45a832f989e520095429589d5b01b0c65da9b574
  2. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <4c86cb2321bd9c72d3b945ce7f747961beda8e65
  3. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <7c2b91b30d74d7c407118ad72502d4ca28af1af6
  4. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <8be39f66915b40d26ea2c18ba84b5c3d5da6809b
  5. Affected versionversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <d23ad76f240c0f597b7a9eb79905d246f27d40df
  6. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <45a832f989e520095429589d5b01b0c65da9b574; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <4c86cb2321bd9c72d3b945ce7f747961beda8e65; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <7c2b91b30d74d7c407118ad72502d4ca28af1af6; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <8be39f66915b40d26ea2c18ba84b5c3d5da6809b; version=3a379bbcea0af6280e1ca0d1edfcf4e68cde6ee0 <d23ad76f240c0f597b7a9eb79905d246f27d40df; version=5.0

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation
T1499Endpoint Denial of Service

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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