CVE-2026-46022

Device-register disclosure or host crash via unchecked indices

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds MMIO read in the IBM ASM driver in Linux Kernel allows attackers to read device registers or crash the host. ibmasm_handle_mouse_interrupt() passes raw queue indices from MMIO through get_queue_entry() without checking REMOTE_QUEUE_SIZE, then copies eight bytes from the computed address. Exploitation requires control of the IBM service processor to corrupt a queue index and assert an interrupt; a sufficiently large index escapes the PCI BAR mapping and triggers a machine check exception.

CVSS severity7.1
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds MMIO read in the IBM ASM driver in Linux Kernel allows attackers to read device registers or crash the host. ibmasm_handle_mouse_interrupt() passes raw queue indices from MMIO through get_queue_entry() without checking REMOTE_QUEUE_SIZE, then copies eight bytes from the computed address. Exploitation requires control of the IBM service processor to corrupt a queue index and assert an interrupt; a sufficiently large index escapes the PCI BAR mapping and triggers a machine check exception.

The record

CVE
CVE-2026-46022
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.6.13
  2. Affected versionversion=278d72ae8803ffcd16070c95fe1d53f4466dc741 <07c4f18b303106e6b24492c12b95d48a4b985841
  3. Affected versionversion=278d72ae8803ffcd16070c95fe1d53f4466dc741 <1ca75f6b74ec7f685464e5745ecfcf3a76d284e9
  4. Affected versionversion=278d72ae8803ffcd16070c95fe1d53f4466dc741 <22a16d3eafee92a165c756081587c95850127107
  5. Affected versionversion=278d72ae8803ffcd16070c95fe1d53f4466dc741 <4b6e6ead556734bdc14024c5f837132b1e7a4b84
  6. Affected versionversion=278d72ae8803ffcd16070c95fe1d53f4466dc741 <fc7e9a74e32299d7e93e178ca482a0b59ef1595b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.13; version=278d72ae8803ffcd16070c95fe1d53f4466dc741 <07c4f18b303106e6b24492c12b95d48a4b985841; version=278d72ae8803ffcd16070c95fe1d53f4466dc741 <1ca75f6b74ec7f685464e5745ecfcf3a76d284e9; version=278d72ae8803ffcd16070c95fe1d53f4466dc741 <22a16d3eafee92a165c756081587c95850127107; version=278d72ae8803ffcd16070c95fe1d53f4466dc741 <4b6e6ead556734bdc14024c5f837132b1e7a4b84; version=278d72ae8803ffcd16070c95fe1d53f4466dc741 <fc7e9a74e32299d7e93e178ca482a0b59ef1595b

Published CVSS scores

7.1NIST NVDCVSS: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo