CVE-2024-56695

Kernel stack overflow via oversized CU occupancy array

Published Dec 28, 2024 · Updated May 11, 2026

Stack exhaustion in the AMD KFD driver in Linux 6.12 allows local users to trigger a kernel stack overflow through a CU occupancy query. kfd_get_cu_occupancy places a 1,056-byte cu_occupancy array on the kernel stack instead of allocating it dynamically. The path requires low-privileged local access and a large AMDGPU_MAX_QUEUES setting; exhausting the stack can crash the kernel.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack exhaustion in the AMD KFD driver in Linux 6.12 allows local users to trigger a kernel stack overflow through a CU occupancy query. kfd_get_cu_occupancy places a 1,056-byte cu_occupancy array on the kernel stack instead of allocating it dynamically. The path requires low-privileged local access and a large AMDGPU_MAX_QUEUES setting; exhausting the stack can crash the kernel.

The record

CVE
CVE-2024-56695
Published
Dec 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.12
  2. Affected versionversion=6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 <6d9f07196389f35a3afebcf1a12c1425725caddd
  3. Affected versionversion=6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 <922f0e00017b09d9d47e3efac008c8b20ed546a0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 <6d9f07196389f35a3afebcf1a12c1425725caddd; version=6ae9e1aba97e4cdaa31a0bfdc07497ad0e915c84 <922f0e00017b09d9d47e3efac008c8b20ed546a0

Published CVSS scores

7.8CanonicalCVSS: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.

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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
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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