CVE-2026-90182

Denial of service via uncleared cgroup congestion

Published Sep 17, 2026 · Updated Sep 17, 2026

DoS in Linux blk-iocost allows local users to degrade cgroup I/O and memory allocation through stale congestion state. In block/blk-iocost.c, ioc_pd_free() removes policy data and cancels its timer without clearing an outstanding delay, leaving no path to reset congestion. The condition requires accumulated I/O debt followed by policy teardown; affected cgroups and descendants retain reduced readahead and allocation throttling for the cgroup's lifetime.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DoS in Linux blk-iocost allows local users to degrade cgroup I/O and memory allocation through stale congestion state. In block/blk-iocost.c, ioc_pd_free() removes policy data and cancels its timer without clearing an outstanding delay, leaving no path to reset congestion. The condition requires accumulated I/O debt followed by policy teardown; affected cgroups and descendants retain reduced readahead and allocation throttling for the cgroup's lifetime.

The record

CVE
CVE-2026-90182
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.4
  2. Affected versionversion=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d
  3. Affected versionversion=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d; version=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

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