{"id":"CVE-2026-72080","title":"kernel: fs/resctrl: Fix use-after-free during unmount (CVE-2026-72080)","summary":"A flaw was found in the Linux kernel's resctrl filesystem. During the unmount process, a timing issue can occur where a concurrent reader of an event file attempts to access memory that has already been released. This 'use-after-free' vuln…","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","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 9"],"published":"2026-08-15","updated":"2026-10-26","sourceUpdated":"2026-10-26T11:08:32+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72080.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72080.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-72080"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2516674"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72080"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72080"},{"url":"https://kernelcve.org/list/?q=CVE-2026-72080"},{"url":"https://lore.kernel.org/linux-cve-announce/2026081521-CVE-2026-72080-751c@gregkh/T"},{"url":"https://git.kernel.org/stable/c/7b7bb07efe41bb646a93c4624aa2bb35df190342"},{"url":"https://git.kernel.org/stable/c/7d330a1d663381579b9d5dafa642b1b3158a0ce2"},{"url":"https://git.kernel.org/stable/c/52fce648607e0d6a76eeb443d78708c49df1c554"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00168,"epssPercentile":0.06138,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:51:36.934072Z"},"scores":{"vendor":4.7,"cna":7.8},"ingestedAt":"2026-10-16T17:24:46.877Z","slug":"CVE-2026-72080","body":"## Overview\n\nA flaw was found in the Linux kernel's resctrl filesystem. During the unmount process, a timing issue can occur where a concurrent reader of an event file attempts to access memory that has already been released. This 'use-after-free' vulnerability allows a local attacker to dereference invalid memory. The most significant consequence is system instability, potentially leading to a denial of service (DoS) where the system becomes unresponsive.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72080.json)\n\n**kernel: fs/resctrl: Fix use-after-free during unmount** — rated Moderate by Red Hat. Released 2026-08-15, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\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":229298,"id":"CVE-2026-72080","ts":1793019669418,"field":"cvss","old":"7.8","new":"4.7"},{"seq":229297,"id":"CVE-2026-72080","ts":1793019669418,"field":"severity","old":"high","new":"medium"}]}