---
id: CVE-2026-98832
title: 'kernel: blk-cgroup: save IRQ state in blkg_tryget_closest() (CVE-2026-98832)'
summary: >-
  A flaw was found in the Linux kernel's block control group (blk-cgroup)
  subsystem. When associating block I/O requests with control groups, the kernel
  prematurely re-enables interrupts while internal locks are still held. A local
  user can …
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 6
affected:
  - enterprise_linux 6
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T21:27:47+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98832'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555235'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98832'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98832'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98832.mbox
  - url: 'https://git.kernel.org/stable/c/9fcf4317384ce6758c3127a6e8914c54cbb9c8cc'
  - url: 'https://git.kernel.org/stable/c/327c428ba79b13e4cc5253333a9d5c0aa5579bdf'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00155
epssPercentile: 0.04642
ingestedAt: '2026-10-18T16:47:32.470Z'
---

## Overview

A flaw was found in the Linux kernel's block control group (blk-cgroup) subsystem. When associating block I/O requests with control groups, the kernel prematurely re-enables interrupts while internal locks are still held. A local user can trigger this flaw during storage operations, causing an interrupt handler to attempt to acquire the locked resource. This results in a system deadlock and a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98832.json)

**kernel: blk-cgroup: save IRQ state in blkg_tryget_closest()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6

Not affected:

- Red Hat Enterprise Linux 10
- 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