CVE-2025-21772

Kernel memory corruption via malformed Mac partition tables

Published Feb 27, 2025 · Updated Aug 5, 2026

Improper input validation in Linux kernel Mac partition probing allows local users to read or corrupt kernel memory via a crafted disk image. The parser trusts attacker-controlled sector sizes and entry offsets, reads entries across sector boundaries, and uses unbounded string operations on fields without guaranteed NUL termination. A low-privileged user with access to a loop or removable block device can disclose adjacent kernel memory or trigger an oops, panic, or heap corruption.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Linux kernel Mac partition probing allows local users to read or corrupt kernel memory via a crafted disk image. The parser trusts attacker-controlled sector sizes and entry offsets, reads entries across sector boundaries, and uses unbounded string operations on fields without guaranteed NUL termination. A low-privileged user with access to a loop or removable block device can disclose adjacent kernel memory or trigger an oops, panic, or heap corruption.

The record

CVE
CVE-2025-21772
Published
Feb 27, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <213ba5bd81b7e97ac6e6190b8f3bc6ba76123625; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <27a39d006f85e869be68c1d5d2ce05e5d6445bf5; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <40a35d14f3c0dc72b689061ec72fc9b193f37d1f; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <6578717ebca91678131d2b1f4ba4258e60536e9f; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <7fa9706722882f634090bfc9af642bf9ed719e27; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <80e648042e512d5a767da251d44132553fe04ae0; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <92527100be38ede924768f4277450dfe8a40e16b; version=02e2a5bfebe99edcf9d694575a75032d53fe1b73 <a3e77da9f843e4ab93917d30c314f0283e28c124; version=2a27f61bd411e564eb4651c18d225f6e9e1de534; version=3.10.99 <3.11; version=3.12.56 <3.13; version=3.14.63 <3.15; version=3.2.75 <3.3; version=3.4.113 <3.5; version=34a906cd9f6445d9510841667eff0d980279ebf3; version=4.4; version=69aad7e01c8e883e9d2f8dc5523bd419bd02d2aa; version=7f4f03c4a1e9a4b9679feafe7625a780864a4e76; version=81a319c5c29913a23947f3d28513974682f3af03

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.1Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-20Improper Input Validation
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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