{"id":"CVE-2026-89746","title":"kernel: tracing: Fix use-after-free with same-name named triggers (CVE-2026-89746)","summary":"A flaw was found in the Linux kernel's tracing component. A local user can exploit a use-after-free vulnerability by registering multiple histogram triggers with the same name. This action causes the kernel to attempt to access freed memor…","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":"CWE-825","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":"2026-09-21","sourceUpdated":"2026-09-21T17:37:00+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89746.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89746.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89746"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532209"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89746"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89746"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89746.mbox"},{"url":"https://git.kernel.org/stable/c/441aa6742dff70297b5f64533a07a6189a026e91"},{"url":"https://git.kernel.org/stable/c/3a8534664426c071c2dfb5b4ffa36b18a2abfd79"},{"url":"https://git.kernel.org/stable/c/477d762be4b0ffaf01429ccd88859e93b0ec28cc"},{"url":"https://git.kernel.org/stable/c/b1a49c22de01faf176d44e5caa765e237353a579"},{"url":"https://git.kernel.org/stable/c/83d1ae0406d8eade219a81b401e201702dd9dc55"},{"url":"https://git.kernel.org/stable/c/a7318172aa332a161fb9618286e64454c827f8fd"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00159,"epssPercentile":0.0552,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.449Z","slug":"CVE-2026-89746","body":"## Overview\n\nA flaw was found in the Linux kernel's tracing component. A local user can exploit a use-after-free vulnerability by registering multiple histogram triggers with the same name. This action causes the kernel to attempt to access freed memory, leading to a system crash and a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · 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 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89746.json)\n\n**kernel: tracing: Fix use-after-free with same-name named triggers** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\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\nAffected","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208948,"id":"CVE-2026-89746","ts":1790062298019,"field":"cvss","old":"7.8","new":"7"},{"seq":183853,"id":"CVE-2026-89746","ts":1789356677686,"field":"cvss","old":"7.8","new":"4.4"},{"seq":183852,"id":"CVE-2026-89746","ts":1789356677686,"field":"severity","old":"high","new":"medium"},{"seq":153632,"id":"CVE-2026-89746","ts":1789285351635,"field":"cvss","old":null,"new":"7.8"},{"seq":153631,"id":"CVE-2026-89746","ts":1789285351635,"field":"severity","old":"none","new":"high"},{"seq":147544,"id":"CVE-2026-89746","ts":1789270211324,"field":"cvss","old":null,"new":"4.4"},{"seq":147543,"id":"CVE-2026-89746","ts":1789270211324,"field":"severity","old":"none","new":"medium"},{"seq":109296,"id":"CVE-2026-89746","ts":1789183731322,"field":"cvss","old":null,"new":"4.4"},{"seq":109295,"id":"CVE-2026-89746","ts":1789183731322,"field":"severity","old":"none","new":"medium"}]}