CVE-2026-89992

Kernel memory corruption via interior-pointer free

Published Sep 16, 2026 · Updated Sep 16, 2026

Invalid memory free in Linux allows attackers to corrupt kernel memory when a device-tree idle power domain is released during teardown. dt_idle_pd_alloc() allocates the full node path, replaces pd->name with a kbasename() interior pointer, and dt_idle_pd_free() passes that non-base pointer to kfree(). The public patch establishes the invalid free but documents no attacker-controlled trigger, demonstrated crash, or further security consequence.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid memory free in Linux allows attackers to corrupt kernel memory when a device-tree idle power domain is released during teardown. dt_idle_pd_alloc() allocates the full node path, replaces pd->name with a kbasename() interior pointer, and dt_idle_pd_free() passes that non-base pointer to kfree(). The public patch establishes the invalid free but documents no attacker-controlled trigger, demonstrated crash, or further security consequence.

The record

CVE
CVE-2026-89992
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=5.18
  2. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <09d002c8fb0261d35ce9d8a705de5db034ee90b8
  3. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <1312ae33b91430ec99e69cd3d47f0e50a4ebf54b
  4. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <2b0ac85512b7f67479127b2713254490662eb13d
  5. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <3394c7ba23336bdb7ece29127130fd01731d42d8
  6. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <a38caa9ed0d5c61c17d88393b14b292199289c1f
  7. Affected versionversion=9d976d6721dfb525b81ce981e1363c70c0975aab <b519dfce1998c323e54a56f911cf708d9ba0e076

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=9d976d6721dfb525b81ce981e1363c70c0975aab <09d002c8fb0261d35ce9d8a705de5db034ee90b8; version=9d976d6721dfb525b81ce981e1363c70c0975aab <1312ae33b91430ec99e69cd3d47f0e50a4ebf54b; version=9d976d6721dfb525b81ce981e1363c70c0975aab <2b0ac85512b7f67479127b2713254490662eb13d; version=9d976d6721dfb525b81ce981e1363c70c0975aab <3394c7ba23336bdb7ece29127130fd01731d42d8; version=9d976d6721dfb525b81ce981e1363c70c0975aab <a38caa9ed0d5c61c17d88393b14b292199289c1f; version=9d976d6721dfb525b81ce981e1363c70c0975aab <b519dfce1998c323e54a56f911cf708d9ba0e076

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

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

No observations available

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

Weakness, pattern, technique

No sourced classifications are available.

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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