{"id":"CVE-2026-89753","title":"kernel: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec() (CVE-2026-89753)","summary":"A flaw was found in the Linux kernel's memory management subsystem. The `shrink_lruvec()` function, responsible for memory reclaim, fails to properly report Read-Copy-Update (RCU) task quiescent states on systems with preemption enabled. T…","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-821","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 6","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T20:25:05+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89753.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89753.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89753"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532148"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89753"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89753"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89753.mbox"},{"url":"https://git.kernel.org/stable/c/25f52e81216884a7444bf07a606691feb09a94e3"},{"url":"https://git.kernel.org/stable/c/3fd50239986302cb050d3649351bcec00fa9d5ab"},{"url":"https://git.kernel.org/stable/c/b5391676c61d94ffe3272dcf6723738b802f79e8"},{"url":"https://git.kernel.org/stable/c/cf3ba0911a1cf8680371ff113b90088edd01d2bb"},{"url":"https://git.kernel.org/stable/c/4f50593c9cbc883d8c9b50148a3e8a8b1fd35f57"},{"url":"https://git.kernel.org/stable/c/4cdc1bdf40944de5c6b118fef07ad23f07844338"},{"url":"https://git.kernel.org/stable/c/a67a00a70a7c8309ca47ea157ef3e8ed3d268f5b"},{"url":"https://git.kernel.org/stable/c/029c9408049f7f582230322057b7075bea594fd5"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00176,"epssPercentile":0.07428,"ingestedAt":"2026-09-14T15:23:07.448Z","slug":"CVE-2026-89753","body":"## Overview\n\nA flaw was found in the Linux kernel's memory management subsystem. The `shrink_lruvec()` function, responsible for memory reclaim, fails to properly report Read-Copy-Update (RCU) task quiescent states on systems with preemption enabled. This can lead to RCU task stalls, causing system unresponsiveness or a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89753.json)\n\n**kernel: mm/vmscan: report RCU-tasks quiescent states in shrink_lruvec()** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205519,"id":"CVE-2026-89753","ts":1789576723146,"field":"cvss","old":"4.7","new":"5.5"},{"seq":204083,"id":"CVE-2026-89753","ts":1789490231364,"field":"cvss","old":null,"new":"4.7"},{"seq":204082,"id":"CVE-2026-89753","ts":1789490231364,"field":"severity","old":"none","new":"medium"},{"seq":147682,"id":"CVE-2026-89753","ts":1789270211865,"field":"cvss","old":null,"new":"4.7"},{"seq":147681,"id":"CVE-2026-89753","ts":1789270211865,"field":"severity","old":"none","new":"medium"},{"seq":109434,"id":"CVE-2026-89753","ts":1789183731900,"field":"cvss","old":null,"new":"4.7"},{"seq":109433,"id":"CVE-2026-89753","ts":1789183731900,"field":"severity","old":"none","new":"medium"}]}