CVE-2025-38088

Kernel-memory disclosure via unchecked mmap extent

Published Jun 30, 2025 · Updated May 11, 2026

Out-of-bounds read in the powernv memtrace mmap handler in Linux allows local users to disclose kernel memory through a crafted mapping. memtrace_mmap checks the requested length and page offset independently, then remaps physical pages without ensuring their combined extent stays inside the allocated trace buffer. Exploitation requires local access to a PowerNV system with memtrace enabled; an oversized, nonzero-offset mapping can disclose adjacent physical memory or interrupt the system.

CVSS severity7.1
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

Out-of-bounds read in the powernv memtrace mmap handler in Linux allows local users to disclose kernel memory through a crafted mapping. memtrace_mmap checks the requested length and page offset independently, then remaps physical pages without ensuring their combined extent stays inside the allocated trace buffer. Exploitation requires local access to a PowerNV system with memtrace enabled; an oversized, nonzero-offset mapping can disclose adjacent physical memory or interrupt the system.

The record

CVE
CVE-2025-38088
Published
Jun 30, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2025CVE 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=08a022ad3dfafc7e33d4529015e14bb75179cacc <620b77b23c41a6546e5548ffe2ea3ad71880dde4
  2. Affected versionversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <81260c41b518b6f32c701425f1427562fa92f293
  3. Affected versionversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <8635e325b85dfb9ddebdfaa6b5605d40d16cd147
  4. Affected versionversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <9c340b56d60545e4a159e41523dd8b23f81d3261
  5. Affected versionversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <bbd5a9ddb0f9750783a48a871c9e12c0b68c5f39
  6. Affected versionversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <cd097df4596f3a1e9d75eb8520162de1eb8485b2
  7. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=08a022ad3dfafc7e33d4529015e14bb75179cacc <620b77b23c41a6546e5548ffe2ea3ad71880dde4; version=08a022ad3dfafc7e33d4529015e14bb75179cacc <81260c41b518b6f32c701425f1427562fa92f293; version=08a022ad3dfafc7e33d4529015e14bb75179cacc <8635e325b85dfb9ddebdfaa6b5605d40d16cd147; version=08a022ad3dfafc7e33d4529015e14bb75179cacc <9c340b56d60545e4a159e41523dd8b23f81d3261; version=08a022ad3dfafc7e33d4529015e14bb75179cacc <bbd5a9ddb0f9750783a48a871c9e12c0b68c5f39; version=08a022ad3dfafc7e33d4529015e14bb75179cacc <cd097df4596f3a1e9d75eb8520162de1eb8485b2; version=5.13

Published CVSS scores

7.1SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.7SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-125Out-of-bounds Read
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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