{"id":"CVE-2026-98507","title":"kernel: mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish (CVE-2026-98507)","summary":"A flaw was found in the Linux kernel's memory management subsystem. Due to a missing synchronization barrier when preparing anonymous virtual memory areas, concurrent memory operations can be reordered. A local attacker can exploit this ra…","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 6","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:27:54+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98507"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554843"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98507"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98507"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98507.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-98507"},{"url":"https://git.kernel.org/stable/c/465e222815c8839445d09028fa4c77e70f7f1c7d"},{"url":"https://git.kernel.org/stable/c/a500df43cde075f6ea4b8bae495d89f2c35b3e16"},{"url":"https://git.kernel.org/stable/c/4cef512a955e4008ae4436a4fc97726976df1fdf"},{"url":"https://git.kernel.org/stable/c/d348a715380bfcc6a611bdf722169d53fd01e735"},{"url":"https://git.kernel.org/stable/c/b6ac0b3f6013c168f22cad97e79967accacb08e1"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00164,"epssPercentile":0.05568,"scores":{"vendor":4.7,"cna":7.8},"ingestedAt":"2026-10-18T15:45:12.286Z","slug":"CVE-2026-98507","body":"## Overview\n\nA flaw was found in the Linux kernel's memory management subsystem. Due to a missing synchronization barrier when preparing anonymous virtual memory areas, concurrent memory operations can be reordered. A local attacker can exploit this race condition by running concurrent threads on adjacent memory regions, causing lock mismatches or improper memory reuse. This flaw primarily results in a kernel hang or deadlock, causing a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, 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 7, Red Hat Enterprise Linux 8, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98507.json)\n\n**kernel: mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nAffected:\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\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\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\nOut of support scope\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":229502,"id":"CVE-2026-98507","ts":1793019823743,"field":"cvss","old":"7.8","new":"4.7"},{"seq":229501,"id":"CVE-2026-98507","ts":1793019823743,"field":"severity","old":"high","new":"medium"},{"seq":228944,"id":"CVE-2026-98507","ts":1792854117244,"field":"cvss","old":null,"new":"7.8"},{"seq":228943,"id":"CVE-2026-98507","ts":1792854117244,"field":"severity","old":"none","new":"high"}]}