CVE-2025-38511

Guest memory exposure via uncleared LMTT pages

Published Aug 16, 2025 · Updated Aug 5, 2026

Information disclosure in the Linux kernel Xe driver allows guest OS users to access stale GPU page mappings through an assigned VF. During VF provisioning, the PF-side LMTT allocator initializes entries only for the provisioned LMEM range, leaving mappings beyond that boundary uncleared. Exploitation requires an SR-IOV virtual function and an affected Xe driver; stale entries can reference another VF's allocations or PF pages.

CVSS severity5.5
Medium
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

Information disclosure in the Linux kernel Xe driver allows guest OS users to access stale GPU page mappings through an assigned VF. During VF provisioning, the PF-side LMTT allocator initializes entries only for the provisioned LMEM range, leaving mappings beyond that boundary uncleared. Exploitation requires an SR-IOV virtual function and an affected Xe driver; stale entries can reference another VF's allocations or PF pages.

The record

CVE
CVE-2025-38511
Published
Aug 16, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.8
  2. Affected versionversion=b1d20405821812ad70d95eefe58cadc6d50b0917 <5d21892c2e15b6a27f8bc907693eca7c6b7cc269
  3. Affected versionversion=b1d20405821812ad70d95eefe58cadc6d50b0917 <705a412a367f383430fa34bada387af2e52eb043
  4. Affected versionversion=b1d20405821812ad70d95eefe58cadc6d50b0917 <ff4b8c9ade1b82979fdd01e6f45b60f92eed26d8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=b1d20405821812ad70d95eefe58cadc6d50b0917 <5d21892c2e15b6a27f8bc907693eca7c6b7cc269; version=b1d20405821812ad70d95eefe58cadc6d50b0917 <705a412a367f383430fa34bada387af2e52eb043; version=b1d20405821812ad70d95eefe58cadc6d50b0917 <ff4b8c9ade1b82979fdd01e6f45b60f92eed26d8

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.5SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8SUSECVSS: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

T1005Data from Local System

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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