CVE-2025-38652

Kernel memory disclosure via unterminated device path

Published Aug 22, 2025 · Updated Aug 5, 2026

An out-of-bounds read in Linux F2FS from 4.10 allows attackers to disclose kernel memory by mounting a crafted filesystem image. f2fs_scan_devices stores a full 64-byte device path in sbi->devs[].path without a NUL terminator, so later string operations read adjacent fields. Exploitation requires a privileged service or administrator to mount the image; the read exposes local kernel data and can fault the mount task or misdirect block-device access.

CVSS severity7.3
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Linux F2FS from 4.10 allows attackers to disclose kernel memory by mounting a crafted filesystem image. f2fs_scan_devices stores a full 64-byte device path in sbi->devs[].path without a NUL terminator, so later string operations read adjacent fields. Exploitation requires a privileged service or administrator to mount the image; the read exposes local kernel data and can fault the mount task or misdirect block-device access.

The record

CVE
CVE-2025-38652
Published
Aug 22, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 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

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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=3c62be17d4f562f43fe1d03b48194399caa35aa5 <1b1efa5f0e878745e94a98022e8edc675a87d78e
  2. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <1cf1ff15f262e8baf12201b270b6a79f9d119b2d
  3. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <345fc8d1838f3f8be7c8ed08d86a13dedef67136
  4. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <3466721f06edff834f99d9f49f23eabc6b2cb78e
  5. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <5661998536af52848cc4d52a377e90368196edea
  6. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <666b7cf6ac9aa074b8319a2b68cba7f2c30023f0
  7. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <70849d33130a2cf1d6010069ed200669c8651fbd
  8. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <755427093e4294ac111c3f9e40d53f681a0fbdaa
  9. Affected versionversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80
  10. Affected versionversion=4.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3c62be17d4f562f43fe1d03b48194399caa35aa5 <1b1efa5f0e878745e94a98022e8edc675a87d78e; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <1cf1ff15f262e8baf12201b270b6a79f9d119b2d; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <345fc8d1838f3f8be7c8ed08d86a13dedef67136; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <3466721f06edff834f99d9f49f23eabc6b2cb78e; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <5661998536af52848cc4d52a377e90368196edea; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <666b7cf6ac9aa074b8319a2b68cba7f2c30023f0; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <70849d33130a2cf1d6010069ed200669c8651fbd; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <755427093e4294ac111c3f9e40d53f681a0fbdaa; version=3c62be17d4f562f43fe1d03b48194399caa35aa5 <dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80; version=4.10

Published CVSS scores

7.3LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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