{"id":"CVE-2026-89747","title":"kernel: tracing: Fix use-after-free in trace_pipe read on sub-buffer order change (CVE-2026-89747)","summary":"A flaw was found in the Linux kernel's tracing component. A local attacker could exploit a use-after-free vulnerability, a type of memory corruption, by manipulating the `trace_pipe` functionality. This occurs when the system attempts to r…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-416","CWE-825"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-09-11","updated":"2026-10-21","sourceUpdated":"2026-10-21T08:01:06+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89747.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89747.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89747"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532358"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89747"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89747"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89747.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-89747"},{"url":"https://git.kernel.org/stable/c/05ebe1e1d7d38c2612bacfefe043a33572ae34cb"},{"url":"https://git.kernel.org/stable/c/ddbe921ed16a0ad2d9e09574c3f3aabec7528325"},{"url":"https://git.kernel.org/stable/c/7a49d19ff9baaf61217e5ec14199c18bc2d93ee4"},{"url":"https://git.kernel.org/stable/c/372f8534244d632ad5118e8a87a11291b01712d3"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00163,"epssPercentile":0.05464,"scores":{"vendor":7,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89747","body":"## Overview\n\nA flaw was found in the Linux kernel's tracing component. A local attacker could exploit a use-after-free vulnerability, a type of memory corruption, by manipulating the `trace_pipe` functionality. This occurs when the system attempts to read from memory that has already been released, leading to unpredictable behavior. Successful exploitation could result in system instability or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89747.json)\n\n**kernel: tracing: Fix use-after-free in trace_pipe read on sub-buffer order change** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-10-21.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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 Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":227038,"id":"CVE-2026-89747","ts":1792585033694,"field":"cvss","old":"7.8","new":"4.7"},{"seq":227037,"id":"CVE-2026-89747","ts":1792585033694,"field":"severity","old":"high","new":"medium"},{"seq":224578,"id":"CVE-2026-89747","ts":1792401418323,"field":"cvss","old":"7","new":"7.8"},{"seq":205487,"id":"CVE-2026-89747","ts":1789576721829,"field":"cvss","old":"4.1","new":"7"},{"seq":205486,"id":"CVE-2026-89747","ts":1789576721829,"field":"severity","old":"medium","new":"high"},{"seq":202968,"id":"CVE-2026-89747","ts":1789403733155,"field":"cvss","old":"7.8","new":"4.1"},{"seq":202967,"id":"CVE-2026-89747","ts":1789403733155,"field":"severity","old":"high","new":"medium"},{"seq":197682,"id":"CVE-2026-89747","ts":1789384318372,"field":"cvss","old":"4.1","new":"7.8"},{"seq":197681,"id":"CVE-2026-89747","ts":1789384318372,"field":"severity","old":"medium","new":"high"},{"seq":183653,"id":"CVE-2026-89747","ts":1789356676271,"field":"cvss","old":"7.8","new":"4.1"},{"seq":183652,"id":"CVE-2026-89747","ts":1789356676271,"field":"severity","old":"high","new":"medium"},{"seq":153634,"id":"CVE-2026-89747","ts":1789285351643,"field":"cvss","old":null,"new":"7.8"},{"seq":153633,"id":"CVE-2026-89747","ts":1789285351643,"field":"severity","old":"none","new":"high"},{"seq":147321,"id":"CVE-2026-89747","ts":1789270209593,"field":"cvss","old":null,"new":"4.1"},{"seq":147320,"id":"CVE-2026-89747","ts":1789270209593,"field":"severity","old":"none","new":"medium"},{"seq":109080,"id":"CVE-2026-89747","ts":1789183730228,"field":"cvss","old":null,"new":"4.1"},{"seq":109079,"id":"CVE-2026-89747","ts":1789183730228,"field":"severity","old":"none","new":"medium"}]}