{"id":"CVE-2026-89752","title":"kernel: mm: memcg: stop reclaim when a limit update is superseded (CVE-2026-89752)","summary":"A flaw was found in the Linux kernel's memory cgroup (memcg) component. When multiple file operations concurrently update `memory.high` or `memory.max` files in `kernfs`, a writer can continue reclaiming memory towards an outdated target. …","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-367","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":"2026-09-21","sourceUpdated":"2026-09-21T17:37:51+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89752"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532245"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89752"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89752"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89752.mbox"},{"url":"https://git.kernel.org/stable/c/39ec1e4183a718f448b2e9de681dcbdda18fce42"},{"url":"https://git.kernel.org/stable/c/9477820c63cbf4d97114238f3d1ff10dfd6bee3f"},{"url":"https://git.kernel.org/stable/c/95d87030cae7764805aa7c621c52871139297cb0"},{"url":"https://git.kernel.org/stable/c/aab391074de96ed601eeca32daef9a8507d436d9"},{"url":"https://git.kernel.org/stable/c/ebf762a393630d1582645be3f0fc22a674eb9122"},{"url":"https://git.kernel.org/stable/c/4ea0617b9e46d26c0a3e5af00308ea1931cc545d"},{"url":"https://git.kernel.org/stable/c/5c6f87d33733d96fba66ea4e78cd8b24b4d60a49"},{"url":"https://git.kernel.org/stable/c/8bf21ad3657305e28deafd9ef16a121407496bc3"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00176,"epssPercentile":0.07428,"ingestedAt":"2026-09-14T15:23:07.448Z","slug":"CVE-2026-89752","body":"## Overview\n\nA flaw was found in the Linux kernel's memory cgroup (memcg) component. When multiple file operations concurrently update `memory.high` or `memory.max` files in `kernfs`, a writer can continue reclaiming memory towards an outdated target. This can lead to an indefinite loop, causing a denial of service (DoS) by blocking the writer and repeatedly incrementing the Out-Of-Memory (OOM) event counter without terminating processes.\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 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89752.json)\n\n**kernel: mm: memcg: stop reclaim when a limit update is superseded** — rated Low 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 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":208943,"id":"CVE-2026-89752","ts":1790062297520,"field":"cvss","old":"4.1","new":"5.5"},{"seq":204037,"id":"CVE-2026-89752","ts":1789490231148,"field":"cvss","old":null,"new":"4.1"},{"seq":204036,"id":"CVE-2026-89752","ts":1789490231148,"field":"severity","old":"none","new":"medium"},{"seq":147486,"id":"CVE-2026-89752","ts":1789270211097,"field":"cvss","old":null,"new":"4.1"},{"seq":147485,"id":"CVE-2026-89752","ts":1789270211097,"field":"severity","old":"none","new":"medium"},{"seq":109242,"id":"CVE-2026-89752","ts":1789183731113,"field":"cvss","old":null,"new":"4.1"},{"seq":109241,"id":"CVE-2026-89752","ts":1789183731113,"field":"severity","old":"none","new":"medium"}]}