CVE-2026-89752

Local writer hang via stale memcg target

Published Sep 11, 2026 · Updated Sep 11, 2026

Denial of service in Linux memory cgroup handling allows local users to hang a writer through concurrent memory.max updates. The memory_max_write reclaim loop compares usage with the first writer's stale local target after a second file updates the live limit. The local user must control the same cgroup limit through separate open files; the first writer then remains blocked and repeatedly increments the OOM event counter.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux memory cgroup handling allows local users to hang a writer through concurrent memory.max updates. The memory_max_write reclaim loop compares usage with the first writer's stale local target after a second file updates the live limit. The local user must control the same cgroup limit through separate open files; the first writer then remains blocked and repeatedly increments the OOM event counter.

The record

CVE
CVE-2026-89752
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0ccab5b139971a2a3f48df24d1ee8be2dbf84042
  2. Affected versionversion=4.4.7 <4.5
  3. Affected versionversion=4.5.1 <4.6
  4. Affected versionversion=4.6
  5. Affected versionversion=97729c37439040ec07807f0dbb71ea60ccbafd27
  6. Affected versionversion=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <39ec1e4183a718f448b2e9de681dcbdda18fce42
  7. Affected versionversion=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <9477820c63cbf4d97114238f3d1ff10dfd6bee3f
  8. Affected versionversion=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <95d87030cae7764805aa7c621c52871139297cb0
  9. Affected versionversion=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <aab391074de96ed601eeca32daef9a8507d436d9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=0ccab5b139971a2a3f48df24d1ee8be2dbf84042; version=4.4.7 <4.5; version=4.5.1 <4.6; version=4.6; version=97729c37439040ec07807f0dbb71ea60ccbafd27; version=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <39ec1e4183a718f448b2e9de681dcbdda18fce42; version=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <9477820c63cbf4d97114238f3d1ff10dfd6bee3f; version=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <95d87030cae7764805aa7c621c52871139297cb0; version=b6e6edcfa40561e9c8abe5eecf1c96f8e5fd9c6f <aab391074de96ed601eeca32daef9a8507d436d9

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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