IBM SECURITY ADVISORY First Issued: Thu Feb 19 16:07:09 CST 2026 The most recent version of this document is available here: https://aix.software.ibm.com/aix/efixes/security/xorg_advisory5.asc Security Bulletin: AIX Xorg X Server is vulnerable to memory corruption or a denial of service (CVE-2025-62230, CVE-2025-62231) =============================================================================== SUMMARY: Vulnerabilities in Xorg X Server could cause a memory corruption or denial of service (CVE-2025-62230, CVE-2025-62231). =============================================================================== VULNERABILITY DETAILS: CVEID: CVE-2025-62230 https://www.cve.org/CVERecord?id=CVE-2025-62230 DESCRIPTION: A flaw was discovered in the X.Org X server's X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memory corruption or a crash when affected clients disconnect. CVSS Base Score: 7.3 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H) CVEID: CVE-2025-62231 https://www.cve.org/CVERecord?id=CVE-2025-62231 DESCRIPTION: A flaw was identified in the X.Org X server's X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash. CVSS Base Score: 7.3 CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H) AFFECTED PRODUCTS AND VERSIONS: AIX 7.2, 7.3 VIOS 4.1 The vulnerabilities in the following filesets are being addressed: key_fileset = aix Fileset Lower Level Upper Level KEY --------------------------------------------------------- X11.base.rte 7.2.5.0 7.2.5.201 key_w_fs X11.base.rte 7.3.0.0 7.3.0.0 key_w_fs X11.base.rte 7.3.3.0 7.3.3.0 key_w_fs X11.base.rte 7.3.4.0 7.3.4.0 key_w_fs To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. Example: lslpp -L | grep -i X11.base.rte REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY ----------------------------------------------------- 7.2.5 IJ57162 ** SP12 key_w_apar 7.3.2 IJ57231 ** N/A key_w_apar 7.3.3 IJ57128 ** SP03 key_w_apar 7.3.4 IJ57232 ** SP01 key_w_apar VIOS Level APAR Availability SP KEY ----------------------------------------------------- 4.1.0 IJ57231 ** N/A key_w_apar 4.1.1 IJ57128 ** 4.1.1.30 key_w_apar 4.1.2 IJ57232 ** 4.1.2.10 key_w_apar Subscribe to the APARs here: https://www.ibm.com/support/pages/apar/[apar number] By subscribing, you will receive periodic email alerting you to the status of the APAR, and a link to download the fix once it becomes available. B. FIXES IBM strongly recommends addressing the vulnerability now. AIX and VIOS fixes are available. The AIX and VIOS fixes can be downloaded via https from: https://aix.software.ibm.com/aix/efixes/security/xorg_fix5.tar The link above is to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. The fixes are cumulative and address previously issued AIX/VIOS Xorg security bulletins with respect to SP and TL, which includes: https://aix.software.ibm.com/aix/efixes/security/xorg_advisory4.asc https://www.ibm.com/support/pages/node/7247777 AIX Level Interim Fix (*.Z) KEY ---------------------------------------------- 7.2.5.9 IJ57162mBa.260217.epkg.Z key_w_fix 7.2.5.10 IJ57162mBa.260217.epkg.Z key_w_fix 7.2.5.11 IJ57162mBa.260217.epkg.Z key_w_fix 7.3.2.2 IJ57231m4a.260217.epkg.Z key_w_fix 7.3.2.3 IJ57231m4a.260217.epkg.Z key_w_fix 7.3.2.4 IJ57231m4a.260217.epkg.Z key_w_fix 7.3.3.0 IJ57128m1a.260217.epkg.Z key_w_fix 7.3.3.1 IJ57128m1a.260217.epkg.Z key_w_fix 7.3.3.2 IJ57128m1a.260217.epkg.Z key_w_fix 7.3.4.0 IJ57232s0a.260128.epkg.Z key_w_fix Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.3.2.3 is AIX 7300-02-03. Please reference the Affected Products and Version section above for help with checking installed fileset levels. VIOS Level Interim Fix (*.Z) KEY ----------------------------------------------- 4.1.0.21 IJ57231m4a.260217.epkg.Z key_w_fix 4.1.0.30 IJ57231m4a.260217.epkg.Z key_w_fix 4.1.0.40 IJ57231m4a.260217.epkg.Z key_w_fix 4.1.1.0 IJ57128m1a.260217.epkg.Z key_w_fix 4.1.1.10 IJ57128m1a.260217.epkg.Z key_w_fix 4.1.1.20 IJ57128m1a.260217.epkg.Z key_w_fix 4.1.2.0 IJ57232s0a.260128.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf xorg_fix5.tar cd xorg_fix5 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- c5a468acb7c8bfc7f387094de5da1588099850edcb80f323eb62b3655f33ffac IJ57128m1a.260217.epkg.Z key_w_csum c283cf3dfb27c7a93de6278f33fd06448d97957d71fd9e01a4b6405e9c26535f IJ57162mBa.260217.epkg.Z key_w_csum e951e374e00e32f3c2a68abccd57d39bb5d8d92649a8d3c3285e4b716523abe5 IJ57231m4a.260217.epkg.Z key_w_csum 5ec7eb21516bc33bac8404188dad3138e68befb8858579ef614a05901ca006d5 IJ57232s0a.260128.epkg.Z key_w_csum The checksums below were generated using the "openssl dgst -sha512 [filename]" command as the following: openssl dgst -sha512 filename ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 3d5d29a73f8512b9b4b7f243ad03d15bbeceb319ff26ba9c7786198489defb14e846de0200e75bb09b198ded2e2393ed1cff2823374b1214315a6cf44251b5ec IJ57128m1a.260217.epkg.Z key_4K_w_csum 201a652b9788283e4a273b8693545557e5e0e46c25c9630c2f770a49ac0984df4b68bf6837813427311d79b6c6810cdda4c1484749a9fa1b25c04f50d65c0de8 IJ57162mBa.260217.epkg.Z key_4K_w_csum 1818eef3d4ac83f189e8758feaee6ca24e8143b1cc121936b2a39dbf90896fa96dd8f6960a8465857b61081403131860c2a2cfe6c6161c6c638aed33edd7cffb IJ57231m4a.260217.epkg.Z key_4K_w_csum f20fc35a7bb65d88ee104cfa4aecf693e6adf288d909cda71294e99369df84b6391b34bcbbad442958d5fae5dd7837cd6b2757b7ef731ce1cdc40c254cbcf950 IJ57232s0a.260128.epkg.Z key_4K_w_csum These sums should match exactly. The OpenSSL signatures in the tar file and on this advisory can also be used to verify the integrity of the fixes. If the sums or signatures cannot be confirmed, contact IBM Support at http://ibm.com/support/ and describe the discrepancy. openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha256 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: https://aix.software.ibm.com/aix/efixes/security/xorg_advisory5.asc.sig C. FIX AND INTERIM FIX INSTALLATION If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding. To preview a fix installation: installp -a -d fix_name -p all # where fix_name is the name of the # fix package being previewed. To install a fix package: installp -a -d fix_name -X all # where fix_name is the name of the # fix package being installed. Interim fixes have had limited functional and regression testing but not the full regression testing that takes place for Service Packs; however, IBM does fully support them. Interim fix management documentation can be found at: https://www.ibm.com/support/pages/managing-interim-fixes-aix To preview an interim fix installation: emgr -e ipkg_name -p # where ipkg_name is the name of the # interim fix package being previewed. To install an interim fix package: emgr -e ipkg_name -X # where ipkg_name is the name of the # interim fix package being installed. WORKAROUNDS AND MITIGATIONS: None. =============================================================================== CONTACT US: Note: Keywords labeled as KEY in this document are used for parsing purposes. If you would like to receive AIX Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications Contact IBM Support for questions related to this announcement: https://ibm.com/support/ For information on how to securely verify AIX security bulletins and fixes: https://www.ibm.com/support/pages/node/6985269 To obtain the OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: https://aix.software.ibm.com/aix/efixes/security/systems_p_os_aix_security_pubkey.txt To verify the AIX/VIOS security bulletin: Published advisory OpenSSL signature file location: https://aix.software.ibm.com/aix/efixes/security/xorg_advisory5.asc.sig openssl dgst -sha256 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] Please contact your local IBM AIX support center for any assistance. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: AIX Xorg X Server is vulnerable to memory corruption or a denial of service (CVE-2025-62230, CVE-2025-62231) https://www.ibm.com/support/pages/node/7261396 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Thu Feb 19 16:07:09 CST 2026 =============================================================================== *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.