{"id":"CVE-2026-80927","title":"kernel: timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex() (CVE-2026-80927)","summary":"A flaw was found in the Linux kernel. A race condition in the timekeeping subsystem, specifically within the __do_adjtimex() function, can occur when the auxiliary clock is handled. This allows uninitialized stack data to be used in calcul…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-367","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10","enterprise_linux 6"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T13:53:55+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80927.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80927.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80927"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532325"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80927"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80927"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80927.mbox"},{"url":"https://git.kernel.org/stable/c/fecf1e37775269ad38c172b468ad4ecc3968aa63"},{"url":"https://git.kernel.org/stable/c/bc59dac50cb45a725f7a50760c7cc72a0964f722"},{"url":"https://git.kernel.org/stable/c/4b61084b11bcecce86d03804ff30f8d7b465593c"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00166,"epssPercentile":0.06253,"ingestedAt":"2026-09-14T00:35:28.532Z","slug":"CVE-2026-80927","body":"## Overview\n\nA flaw was found in the Linux kernel. A race condition in the timekeeping subsystem, specifically within the __do_adjtimex() function, can occur when the auxiliary clock is handled. This allows uninitialized stack data to be used in calculations and subsequently leaked to userspace, leading to information disclosure.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80927.json)\n\n**kernel: timekeeping: Check the return value of tk_get_aux_ts64 in __do_adjtimex()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\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","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202781,"id":"CVE-2026-80927","ts":1789403715884,"field":"cvss","old":null,"new":"5.5"},{"seq":202780,"id":"CVE-2026-80927","ts":1789403715884,"field":"severity","old":"none","new":"medium"},{"seq":147373,"id":"CVE-2026-80927","ts":1789270210649,"field":"cvss","old":null,"new":"2.8"},{"seq":147372,"id":"CVE-2026-80927","ts":1789270210649,"field":"severity","old":"none","new":"low"},{"seq":109131,"id":"CVE-2026-80927","ts":1789183730431,"field":"cvss","old":null,"new":"2.8"},{"seq":109130,"id":"CVE-2026-80927","ts":1789183730431,"field":"severity","old":"none","new":"low"}]}