{"id":"CVE-2026-98826","title":"kernel: kernel: Denial of service via use-after-free in the AC100 RTC driver (CVE-2026-98826)","summary":"A flaw was found in the Linux kernel's AC100 Real-Time Clock (RTC) driver. If device initialization fails during driver probing, unmanaged clock provider references remain registered in global system lists while their underlying memory is …","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 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-20","sourceUpdated":"2026-10-20T06:08:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98826.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98826.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98826"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555253"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98826"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98826"},{"url":"https://git.kernel.org/stable/c/12bcd20d76703ee2baf52224d287b7fea096b12f"},{"url":"https://git.kernel.org/stable/c/55ca60ba336632349f7c4585d22ba74ae355b7ce"},{"url":"https://git.kernel.org/stable/c/9cff19ddd7f90c1f572a0f83cfc41de8f8dcbcd8"},{"url":"https://git.kernel.org/stable/c/fcf0b58e976e83adf246b014518e49c662b96f5e"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.002,"epssPercentile":0.09736,"ingestedAt":"2026-10-18T16:47:32.472Z","slug":"CVE-2026-98826","body":"## Overview\n\nA flaw was found in the Linux kernel's AC100 Real-Time Clock (RTC) driver. If device initialization fails during driver probing, unmanaged clock provider references remain registered in global system lists while their underlying memory is released. Subsequent lookups referencing the affected device can access this freed memory, triggering a use-after-free condition that can lead to a system crash and 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 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98826.json)\n\n**kernel: kernel: Denial of service via use-after-free in the AC100 RTC driver** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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":225702,"id":"CVE-2026-98826","ts":1792498378354,"field":"cvss","old":null,"new":"4.7"},{"seq":225701,"id":"CVE-2026-98826","ts":1792498378354,"field":"severity","old":"none","new":"medium"}]}