CVE-2024-38578

Kernel memory corruption via undersized eCryptfs packet

Published Jun 19, 2024 · Updated Aug 5, 2026

Out-of-bounds write in Linux eCryptfs on affected Linux and Siemens products allows local users to corrupt kernel memory during file creation. The eCryptfs TAG 66 size calculation omits a cipher byte and two checksum bytes, so write_tag_66_packet writes three bytes beyond its allocation. A private-key authentication token and an eCryptfs mount are required; triggering the overwrite can crash the system.

CVSS severity7.8
High
EPSS probability0.26%
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 write in Linux eCryptfs on affected Linux and Siemens products allows local users to corrupt kernel memory during file creation. The eCryptfs TAG 66 size calculation omits a cipher byte and two checksum bytes, so write_tag_66_packet writes three bytes beyond its allocation. A private-key authentication token and an eCryptfs mount are required; triggering the overwrite can crash the system.

The record

CVE
CVE-2024-38578
Published
Jun 19, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE 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=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=2.6.21; version=dddfa461fc8951f9b5f951c13565b6cac678635a <0d0f8ba042af16519f1ef7dd10463a33b21b677c; version=dddfa461fc8951f9b5f951c13565b6cac678635a <12db25a54ce6bb22b0af28010fff53ef9cb3fe93; version=dddfa461fc8951f9b5f951c13565b6cac678635a <1c125b9287e58f364d82174efb167414b92b11f1; version=dddfa461fc8951f9b5f951c13565b6cac678635a <235b85981051cd68fc215fd32a81c6f116bfc4df; version=dddfa461fc8951f9b5f951c13565b6cac678635a <2ed750b7ae1b5dc72896d7dd114c419afd3d1910; version=dddfa461fc8951f9b5f951c13565b6cac678635a <85a6a1aff08ec9f5b929d345d066e2830e8818e5; version=dddfa461fc8951f9b5f951c13565b6cac678635a <a20f09452e2f58f761d11ad7b96b5c894c91030e; version=dddfa461fc8951f9b5f951c13565b6cac678635a <edbfc42ab080e78c6907d40a42c9d10b69e445c1; version=dddfa461fc8951f9b5f951c13565b6cac678635a <f6008487f1eeb8693f8d2a36a89c87d9122ddf74
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CVE teamCVSS: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.

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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-787Out-of-bounds Write
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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