{"id":"CVE-2026-98818","title":"kernel: mm/slab: do not wake up kswapd in __kfree_rcu_sheaf() (CVE-2026-98818)","summary":"A flaw was found in the Linux kernel. When freeing memory through the slab allocator, the system may attempt to wake the kernel swap daemon while an internal scheduler lock is already held. This unsafe sequence can trigger a circular locki…","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-833","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T03:00:00+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98818.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98818.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98818"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555208"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98818"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98818"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98818.mbox"},{"url":"https://git.kernel.org/stable/c/46545c86b54ffb969b6e3662942b4a6191619eaa"},{"url":"https://git.kernel.org/stable/c/af2fb3ee6679b517e2fdbd3ba16ec276a8b74312"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00162,"epssPercentile":0.05392,"ingestedAt":"2026-10-18T16:47:32.476Z","slug":"CVE-2026-98818","body":"## Overview\n\nA flaw was found in the Linux kernel. When freeing memory through the slab allocator, the system may attempt to wake the kernel swap daemon while an internal scheduler lock is already held. This unsafe sequence can trigger a circular locking dependency and cause a system deadlock. A local user could exploit this condition to trigger a system hang, resulting in a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98818.json)\n\n**kernel: mm/slab: do not wake up kswapd in __kfree_rcu_sheaf()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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 Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228560,"id":"CVE-2026-98818","ts":1792844789080,"field":"cvss","old":null,"new":"4.7"},{"seq":228559,"id":"CVE-2026-98818","ts":1792844789080,"field":"severity","old":"none","new":"medium"}]}