{"id":"CVE-2026-89439","title":"platform/x86: ISST: Add a NULL check for sst_inst[]","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Add a NULL check for sst_inst[]\n\nTo be consistent with other places, add a NULL check for failed socket\nloading by checking isst_common.sst_inst[].","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < f7c9370dd1d3cedb80c635528271cab1d0bcb103","Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < 49a95fe1f64f41c2e8959e525aefdb10f23b293e","Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa","Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < ef7975af15126dd70ace519da7bb33f2848b9064","Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < 3de2776e9d7073765c10c2326c2bda5926811ea6","Linux 6.4"],"published":"2026-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:47:27.422Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89439","references":[{"url":"https://git.kernel.org/stable/c/f7c9370dd1d3cedb80c635528271cab1d0bcb103"},{"url":"https://git.kernel.org/stable/c/49a95fe1f64f41c2e8959e525aefdb10f23b293e"},{"url":"https://git.kernel.org/stable/c/c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa"},{"url":"https://git.kernel.org/stable/c/ef7975af15126dd70ace519da7bb33f2848b9064"},{"url":"https://git.kernel.org/stable/c/3de2776e9d7073765c10c2326c2bda5926811ea6"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89439.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89439"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532216"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89439"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89439"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89439.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10582,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-89439","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Add a NULL check for sst_inst[]\n\nTo be consistent with other places, add a NULL check for failed socket\nloading by checking isst_common.sst_inst[].\n\n## Affected\n\n- `Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < f7c9370dd1d3cedb80c635528271cab1d0bcb103`\n- `Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < 49a95fe1f64f41c2e8959e525aefdb10f23b293e`\n- `Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa`\n- `Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < ef7975af15126dd70ace519da7bb33f2848b9064`\n- `Linux >= d805456c712f93ba8a012430f2a93bec133b6ff4 < 3de2776e9d7073765c10c2326c2bda5926811ea6`\n- `Linux 6.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89439.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204115,"id":"CVE-2026-89439","ts":1789490231724,"field":"cvss","old":null,"new":"5.5"},{"seq":204114,"id":"CVE-2026-89439","ts":1789490231724,"field":"severity","old":"none","new":"medium"},{"seq":147534,"id":"CVE-2026-89439","ts":1789270211286,"field":"cvss","old":null,"new":"4.4"},{"seq":147533,"id":"CVE-2026-89439","ts":1789270211286,"field":"severity","old":"none","new":"medium"},{"seq":109284,"id":"CVE-2026-89439","ts":1789183731275,"field":"cvss","old":null,"new":"4.4"},{"seq":109283,"id":"CVE-2026-89439","ts":1789183731275,"field":"severity","old":"none","new":"medium"}]}