{"id":"CVE-2026-89449","title":"kernel: iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add (CVE-2026-89449)","summary":"A flaw was found in the Linux kernel's Input-Output Memory Management Unit (IOMMU) subsystem. When a device addition fails during the `iommu_mock_device_add()` operation, the allocated device IOMMU structure is not properly deallocated. Th…","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-772","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:55:16+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89449.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89449.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89449"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532262"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89449"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89449"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89449.mbox"},{"url":"https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5"},{"url":"https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370"},{"url":"https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.06257,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-89449","body":"## Overview\n\nA flaw was found in the Linux kernel's Input-Output Memory Management Unit (IOMMU) subsystem. When a device addition fails during the `iommu_mock_device_add()` operation, the allocated device IOMMU structure is not properly deallocated. This oversight leads to a memory leak, which over time could be exploited by a local attacker to cause a denial of service (DoS) by exhausting system memory.\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 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89449.json)\n\n**kernel: iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204039,"id":"CVE-2026-89449","ts":1789490231156,"field":"cvss","old":null,"new":"5.5"},{"seq":204038,"id":"CVE-2026-89449","ts":1789490231156,"field":"severity","old":"none","new":"medium"},{"seq":147480,"id":"CVE-2026-89449","ts":1789270211074,"field":"cvss","old":null,"new":"5.5"},{"seq":147479,"id":"CVE-2026-89449","ts":1789270211074,"field":"severity","old":"none","new":"medium"},{"seq":109240,"id":"CVE-2026-89449","ts":1789183731106,"field":"cvss","old":null,"new":"5.5"},{"seq":109239,"id":"CVE-2026-89449","ts":1789183731106,"field":"severity","old":"none","new":"medium"}]}