ESB-2026.4864

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4864 IBM MQ Appliance is affected by an integer overflow (CVE-2022-50865) 8 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: IBM MQ Appliance Publisher: IBM Operating System: Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-50865 Original Bulletin: https://www.ibm.com/support/pages/node/7270301 Comment: CVSS (Max): 7.5 CVE-2022-50865 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: IBM Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 0.0% (10th)* CVE-2022-50865 2026-05-07 * Not all EPSS found when published - --------------------------BEGIN INCLUDED TEXT-------------------- IBM Support Document Information Document number : 7270301 Modified date : More support for: IBM MQ Appliance Product : IBM MQ Appliance Component : - Software version : 9.4 LTS; 9.4 CD Operating system(s): Appliance Security Bulletin Summary IBM MQ Appliance has addressed an integer overflow. Vulnerability Details CVEID: CVE-2022-50865 DESCRIPTION: In the Linux kernel, the following vulnerability has been resolved: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and in tcp_add_backlog(), the variable limit is caculated by adding sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value of int and overflow. This patch reduces the limit budget by halving the sndbuf to solve this issue since ACK packets are much smaller than the payload. CVSS Source: Red Hat CVSS Base score: 7.5 CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Affected Products and Versions +-------------------+-----------------------------+ |Affected Product(s)|Version(s) | +-------------------+-----------------------------+ |IBM MQ Appliance |9.4 LTS - 9.4.0.0 to 9.4.0.17| +-------------------+-----------------------------+ |IBM MQ Appliance |9.4 CD - 9.4.1.0 to 9.4.5.0 | +-------------------+-----------------------------+ Remediation/Fixes This vulnerability is addressed under known issue DT465807 IBM strongly recommends addressing the vulnerability now. IBM MQ Appliance version 9.4 LTS Apply IBM MQ Appliance fix pack 9.4.0.20 , or later firmware. IBM MQ Appliance version 9.4 CD Apply IBM MQ Appliance continuous delivery release 9.4.5.1 , or later firmware. Workarounds and Mitigations None Change History *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. 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