{"id":"CVE-2026-80862","title":"kernel: nvme-tcp: fix usage of page_frag_cache (CVE-2026-80862)","summary":"A flaw was found in the Linux kernel's nvme-tcp component. When block devices are created in parallel threads, the `page_frag_cache` is used in a manner that is not thread-safe. This can lead to incorrect reference counting of memory pages…","severity":"medium","cvss":5.1,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/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","openshift_container_platform 4"],"published":"2026-09-04","updated":"2026-10-24","sourceUpdated":"2026-10-24T02:32:05+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80862.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80862.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80862"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2528637"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80862"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80862"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80862.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-80862"},{"url":"https://git.kernel.org/stable/c/d19f98c79f1b7e09e4cdf5c20d626e571e487467"},{"url":"https://git.kernel.org/stable/c/64561afb42d8390695bf810d9bbd087cbca00291"},{"url":"https://git.kernel.org/stable/c/0a9750263ffacbbd2048a391fd4bd22e2146c57d"},{"url":"https://git.kernel.org/stable/c/6e4cf281558709b92ec2ca3054fe2ffc69266ef9"},{"url":"https://git.kernel.org/stable/c/36ac05f7cfd59d90c597071304b14e98090d5dd1"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00157,"epssPercentile":0.04784,"ingestedAt":"2026-10-19T09:16:01.491Z","slug":"CVE-2026-80862","body":"## Overview\n\nA flaw was found in the Linux kernel's nvme-tcp component. When block devices are created in parallel threads, the `page_frag_cache` is used in a manner that is not thread-safe. This can lead to incorrect reference counting of memory pages and premature freeing, potentially causing a system crash (Denial of Service).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80862.json)\n\n**kernel: nvme-tcp: fix usage of page_frag_cache** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift Container Platform 4\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":28,"depthScoreParts":{"impact":28.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228571,"id":"CVE-2026-80862","ts":1792844795553,"field":"cvss","old":null,"new":"5.1"},{"seq":228570,"id":"CVE-2026-80862","ts":1792844795553,"field":"severity","old":"none","new":"medium"}]}