CVE-2026-43206

Local privilege escalation via unchecked KFD buffer clearing

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds write in the AMD KFD event subsystem in Linux Kernel allows local users to escalate privileges via a crafted event-page buffer. The kfd_event_page_set() function clears KFD_SIGNAL_EVENT_LIMIT * 8 bytes with memset without verifying that the supplied GPU buffer is that large. Exploitation requires local code execution and access to KFD/AMDGPU device nodes; the deterministic kernel-memory overwrite can corrupt the kernel or grant higher privileges.

CVSS severity7.8
High
EPSS probability0.14%
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 write in the AMD KFD event subsystem in Linux Kernel allows local users to escalate privileges via a crafted event-page buffer. The kfd_event_page_set() function clears KFD_SIGNAL_EVENT_LIMIT * 8 bytes with memset without verifying that the supplied GPU buffer is that large. Exploitation requires local code execution and access to KFD/AMDGPU device nodes; the deterministic kernel-memory overwrite can corrupt the kernel or grant higher privileges.

The record

CVE
CVE-2026-43206
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e04bc310d80b46eaf481f1fefcbcb37a187412d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4857c37c7ba9aa38b9a4c694e8bd8d0091c87940
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4e72f419e4ed44cb3b60506752d8688c20a60a9b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75fb57efdd7863fffbc39db23e9cad7aafda26ed
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a70a26c9f34baea6c3199a9862ddaff4554a96d
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b4034442cb090e4a980bdcc1540948606cbc951b
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e04bc310d80b46eaf481f1fefcbcb37a187412d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4857c37c7ba9aa38b9a4c694e8bd8d0091c87940; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4e72f419e4ed44cb3b60506752d8688c20a60a9b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75fb57efdd7863fffbc39db23e9cad7aafda26ed; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8a70a26c9f34baea6c3199a9862ddaff4554a96d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b4034442cb090e4a980bdcc1540948606cbc951b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5Canonical UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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-787Out-of-bounds Write
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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