{"id":"CVE-2026-89750","title":"kernel: tracing/user_events: Clear copied tracing state before fork duplication (CVE-2026-89750)","summary":"A flaw was found in the Linux kernel's tracing/user_events component. This vulnerability arises when a child process, created via `fork`, exits and frees memory that the parent process still references. This creates a Use-After-Free (UAF) …","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-825","vendor":"Red Hat","product":"Linux","affected":["Linux >= 7235759084a4f8524a46bd2638885ff3b34ce279 < 33ce55b368b64d65941867add00e7f288cbb8234","Linux >= 7235759084a4f8524a46bd2638885ff3b34ce279 < 63b39e49a4c9d68e010e96b26fc7374f0864f2b1","Linux >= 7235759084a4f8524a46bd2638885ff3b34ce279 < 25a0758cf6bdbfddac2be71124c9bd0692f4b0b1","Linux >= 7235759084a4f8524a46bd2638885ff3b34ce279 < b799f67119aff179719a0b1e12441ebbdaaf62f9","Linux >= 7235759084a4f8524a46bd2638885ff3b34ce279 < 390f6bd8583d177029d9df4bea6667509e55a765","Linux 6.4"],"published":"2026-09-11","updated":"2026-09-21","sourceUpdated":"2026-09-21T17:37:43+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89750.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89750.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89750"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532248"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89750"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89750"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89750.mbox"},{"url":"https://git.kernel.org/stable/c/33ce55b368b64d65941867add00e7f288cbb8234"},{"url":"https://git.kernel.org/stable/c/63b39e49a4c9d68e010e96b26fc7374f0864f2b1"},{"url":"https://git.kernel.org/stable/c/25a0758cf6bdbfddac2be71124c9bd0692f4b0b1"},{"url":"https://git.kernel.org/stable/c/b799f67119aff179719a0b1e12441ebbdaaf62f9"},{"url":"https://git.kernel.org/stable/c/390f6bd8583d177029d9df4bea6667509e55a765"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00159,"epssPercentile":0.05437,"scores":{"vendor":5.5,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.448Z","slug":"CVE-2026-89750","body":"## Overview\n\nA flaw was found in the Linux kernel's tracing/user_events component. This vulnerability arises when a child process, created via `fork`, exits and frees memory that the parent process still references. This creates a Use-After-Free (UAF) condition, where the parent process attempts to access freed memory. A local attacker could exploit this flaw to cause memory corruption, potentially leading to a denial of service or privilege escalation.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89750.json)\n\n**kernel: tracing/user_events: Clear copied tracing state before fork duplication** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208946,"id":"CVE-2026-89750","ts":1790062297769,"field":"cvss","old":"7.8","new":"5.5"},{"seq":208945,"id":"CVE-2026-89750","ts":1790062297769,"field":"severity","old":"high","new":"medium"},{"seq":197670,"id":"CVE-2026-89750","ts":1789384318328,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197669,"id":"CVE-2026-89750","ts":1789384318328,"field":"severity","old":"medium","new":"high"},{"seq":183657,"id":"CVE-2026-89750","ts":1789356676806,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183656,"id":"CVE-2026-89750","ts":1789356676806,"field":"severity","old":"high","new":"medium"},{"seq":153638,"id":"CVE-2026-89750","ts":1789285351659,"field":"cvss","old":null,"new":"7.8"},{"seq":153637,"id":"CVE-2026-89750","ts":1789285351659,"field":"severity","old":"none","new":"high"},{"seq":147492,"id":"CVE-2026-89750","ts":1789270211121,"field":"cvss","old":null,"new":"4.7"},{"seq":147491,"id":"CVE-2026-89750","ts":1789270211121,"field":"severity","old":"none","new":"medium"},{"seq":109244,"id":"CVE-2026-89750","ts":1789183731121,"field":"cvss","old":null,"new":"4.7"},{"seq":109243,"id":"CVE-2026-89750","ts":1789183731121,"field":"severity","old":"none","new":"medium"}]}