Security Bulletin
Summary
Stack buffer overflow vulnerability in OpenSSL shipped with OS Image for Red Hat Enterprise Linux System affect IBM Cloud Pak System. Stack buffer overflow that can be exploited by a remote attacker to cause a Denial of Service (DoS) or potentially allow for remote code execution.
Vulnerability Details
CVEID: CVE-2025-15467
DESCRIPTION: Issue summary: Parsing CMS AuthEnvelopedData message with maliciously
crafted AEAD parameters can trigger a stack buffer overflow.
Impact summary: A stack buffer overflow may lead to a crash, causing Denial
of Service, or potentially remote code execution.
When parsing CMS AuthEnvelopedData structures that use AEAD ciphers such as
AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is
copied into a fixed-size stack buffer without verifying that its length fits
the destination. An attacker can supply a crafted CMS message with an
oversized IV, causing a stack-based out-of-bounds write before any
authentication or tag verification occurs.
Applications and services that parse untrusted CMS or PKCS#7 content using
AEAD ciphers (e.g., S/MIME AuthEnvelopedData with AES-GCM) are vulnerable.
Because the overflow occurs prior to authentication, no valid key material
is required to trigger it. While exploitability to remote code execution
depends on platform and toolchain mitigations, the stack-based write
primitive represents a severe risk.
The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this
issue, as the CMS implementation is outside the OpenSSL FIPS module
boundary.
OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue.
OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.
CWE: CWE-787: Out-of-bounds Write
CVSS Source: CISA ADP
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM OS Image for Red Hat Linux Systems | 5.0.1.0 |
Remediation/Fixes
A Stack buffer overflow vulnerability in OpenSSL have been found that that can be exploited by a remote attacker to cause a Denial of Service (DoS) or potentially allow for remote code execution. The vulnerability affects OS Image for Red Hat Enterprise Linux System v5.0* which is based on Red Hat Enterprise Linux v9 affected as per Red Hat Errata.
IBM strongly recommends addressing the vulnerability now by upgrading to version 2.3.6.1, apply fix as per instructions below
Prerequisite : Red Hat Satellite
* for OS Image for Red Hat Enterprise Linux System v5.0.1.0,
- update to Red Hat Enterprise Linux System v5.0.2.0 based on Red Hat Enterprise Linux 9.6
- run command: dnf update --advisory=RHSA-2026:1503
* for OS Image for Red Hat Enterprise Linux System v5.0.2.0,
- run command: dnf update --advisory=RHSA-2026:1503
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
16 Feb 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
Was this topic helpful?
Document Information
Modified date:
16 February 2026
Initial Publish date:
16 February 2026
UID
ibm17260911