---
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: 0.00206
epssPercentile: 0.09477
ingestedAt: '2026-09-14T00:35:28.532Z'
---

## Overview

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 calculations and subsequently leaked to userspace, leading to information disclosure.

## Vendor advisories

- **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)

**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.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope