CVE-2026-45878

Kernel memory corruption via unchecked watch identifier

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds access in Linux Kernel's AMD KFD debug subsystem allows local users to corrupt kernel memory through a debug-trap ioctl. kfd_dbg_trap_clear_dev_address_watch uses an unchecked 32-bit watch_id to index the four-entry watch_points array after signed conversion and invalid bit shifts. Access to /dev/kfd and self-debugging is required; a crafted identifier can overwrite kernel memory or trigger an oops or panic.

CVSS severity7.8
High
EPSS probability0.18%
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 Linux Kernel's AMD KFD debug subsystem allows local users to corrupt kernel memory through a debug-trap ioctl. kfd_dbg_trap_clear_dev_address_watch uses an unchecked 32-bit watch_id to index the four-entry watch_points array after signed conversion and invalid bit shifts. Access to /dev/kfd and self-debugging is required; a crafted identifier can overwrite kernel memory or trigger an oops or panic.

The record

CVE
CVE-2026-45878
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-681, T1499.004, T1068
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

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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=6.5
  2. Affected versionversion=e0f85f4690d089cc1a60337decafb1acf7eec45e <2b36c0c1bcbbe15f6cfa9652084b3124c835a150
  3. Affected versionversion=e0f85f4690d089cc1a60337decafb1acf7eec45e <3c38a0f07aa2bfef2b219b1f045534ad93f85afd
  4. Affected versionversion=e0f85f4690d089cc1a60337decafb1acf7eec45e <5a19302cab5cec7ae7f1a60c619951e6c17d8742
  5. Affected versionversion=e0f85f4690d089cc1a60337decafb1acf7eec45e <971bf8e61e9b4abaacf9b35eaf76ec222758f9d6
  6. Affected versionversion=e0f85f4690d089cc1a60337decafb1acf7eec45e <a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.5; version=e0f85f4690d089cc1a60337decafb1acf7eec45e <2b36c0c1bcbbe15f6cfa9652084b3124c835a150; version=e0f85f4690d089cc1a60337decafb1acf7eec45e <3c38a0f07aa2bfef2b219b1f045534ad93f85afd; version=e0f85f4690d089cc1a60337decafb1acf7eec45e <5a19302cab5cec7ae7f1a60c619951e6c17d8742; version=e0f85f4690d089cc1a60337decafb1acf7eec45e <971bf8e61e9b4abaacf9b35eaf76ec222758f9d6; version=e0f85f4690d089cc1a60337decafb1acf7eec45e <a0d367e13db63a6ed76ee0d0a8c3a58c1fa98488

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

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 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-681Incorrect Conversion between Numeric Types
T1499.004Application or System Exploitation
T1068Exploitation for Privilege Escalation

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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