{"id":"CVE-2026-89762","title":"kernel: apparmor: fix cred UAF caused by begin_current_label_crit_section() (CVE-2026-89762)","summary":"A flaw was found in the Linux kernel's AppArmor security module. The begin_current_label_crit_section() function, used in various Linux Security Module (LSM) hooks, attempts to replace user credentials when a security label becomes stale. …","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":"Red Hat OpenShift Container Platform 4","affected":["openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T11:39:48+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89762"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532435"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89762"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89762"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89762.mbox"},{"url":"https://git.kernel.org/stable/c/361488984d668235438faac28635f3632351407f"},{"url":"https://git.kernel.org/stable/c/3f4ae5fab613dca01d6a2a8210dd832e009fcf47"},{"url":"https://git.kernel.org/stable/c/580f777d6d9fd07fc034bd1aeba5c30fd48871a2"},{"url":"https://git.kernel.org/stable/c/587a6a92b93ec314c583bbf747413af170d42540"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.0012,"epssPercentile":0.02061,"scores":{"vendor":5.2,"cna":7.8},"ingestedAt":"2026-09-14T15:23:07.472Z","slug":"CVE-2026-89762","body":"## Overview\n\nA flaw was found in the Linux kernel's AppArmor security module. The begin_current_label_crit_section() function, used in various Linux Security Module (LSM) hooks, attempts to replace user credentials when a security label becomes stale. This process can lead to a Use-After-Free (UAF) vulnerability if the old credentials are still referenced or if the replacement occurs with overridden credentials. A local attacker could potentially exploit this flaw to achieve privilege escalation or cause a denial of service.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89762.json)\n\n**kernel: apparmor: fix cred UAF caused by begin_current_label_crit_section()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\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":203897,"id":"CVE-2026-89762","ts":1789490215404,"field":"cvss","old":"5.2","new":"5.5"},{"seq":202954,"id":"CVE-2026-89762","ts":1789403733098,"field":"cvss","old":"7.8","new":"5.2"},{"seq":202953,"id":"CVE-2026-89762","ts":1789403733098,"field":"severity","old":"high","new":"medium"},{"seq":197666,"id":"CVE-2026-89762","ts":1789384318313,"field":"cvss","old":"5.2","new":"7.8"},{"seq":197665,"id":"CVE-2026-89762","ts":1789384318313,"field":"severity","old":"medium","new":"high"},{"seq":183641,"id":"CVE-2026-89762","ts":1789356676223,"field":"cvss","old":"7.8","new":"5.2"},{"seq":183640,"id":"CVE-2026-89762","ts":1789356676223,"field":"severity","old":"high","new":"medium"},{"seq":153650,"id":"CVE-2026-89762","ts":1789285351723,"field":"cvss","old":null,"new":"7.8"},{"seq":153649,"id":"CVE-2026-89762","ts":1789285351723,"field":"severity","old":"none","new":"high"},{"seq":147209,"id":"CVE-2026-89762","ts":1789270201404,"field":"cvss","old":null,"new":"5.2"},{"seq":147208,"id":"CVE-2026-89762","ts":1789270201404,"field":"severity","old":"none","new":"medium"},{"seq":108960,"id":"CVE-2026-89762","ts":1789183729743,"field":"cvss","old":null,"new":"5.2"},{"seq":108959,"id":"CVE-2026-89762","ts":1789183729743,"field":"severity","old":"none","new":"medium"}]}