CVE-2023-5249

Freed kernel-memory access via software race

Published Feb 5, 2024 · Updated Aug 2, 2024

Use-after-free in Arm Bifrost and Valhall GPU Kernel Drivers r35p0 through r40p0 allows local users to access freed kernel memory. The drivers process GPU memory during a software race after the user carefully prepares system memory, leaving a freed allocation reachable. Local non-privileged access is required; Arm has not published the affected function, and consequences beyond freed-memory access remain undisclosed.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Arm Bifrost and Valhall GPU Kernel Drivers r35p0 through r40p0 allows local users to access freed kernel memory. The drivers process GPU memory during a software race after the user carefully prepares system memory, leaving a freed allocation reachable. Local non-privileged access is required; Arm has not published the affected function, and consequences beyond freed-memory access remain undisclosed.

The record

CVE
CVE-2023-5249
Published
Feb 5, 2024
Updated
Aug 2, 2024
Vendor
Arm
Product
Valhall GPU Kernel Driver
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=r35p0 <=r40p0
  2. Affected versionversion=r35p0 <=r40p0 changes=[{"at":"r41p0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Arm · Valhall GPU Kernel Driverversion=r35p0 <=r40p0; version=r35p0 <=r40p0 changes=[{"at":"r41p0","status":"unaffected"}]
Arm · Bifrost GPU Kernel Driverversion=r35p0 <=r40p0; version=r35p0 <=r40p0 changes=[{"at":"r41p0","status":"unaffected"}]

Published CVSS scores

7.0CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NIST NVDCVSS:3.1/AV:L/AC:H/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-416Use After Free
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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