CVE-2026-89961

Unspecified impact via incorrect PFN tracking

Published Sep 16, 2026 · Updated Sep 16, 2026

Incorrect PFN tracking in Linux 6.6 on powerpc allows attackers to cause unspecified impact via unspecified vectors. vmemmap_populate_compound_pages advances addr_pfn inconsistently with vmemmap addresses, so pfn_offset can select the wrong compound-page head or tail mapping. The affected path is limited to powerpc compound vmemmap population; public material identifies neither an attacker-controlled trigger nor a concrete security consequence.

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

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Summary

What happened

Incorrect PFN tracking in Linux 6.6 on powerpc allows attackers to cause unspecified impact via unspecified vectors. vmemmap_populate_compound_pages advances addr_pfn inconsistently with vmemmap addresses, so pfn_offset can select the wrong compound-page head or tail mapping. The affected path is limited to powerpc compound vmemmap population; public material identifies neither an attacker-controlled trigger nor a concrete security consequence.

The record

CVE
CVE-2026-89961
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=6.6
  2. Affected versionversion=f2b79c0d79683d552369bb9a7282c1f0226fc566 <7968852a7ca3ce81477ec5b4494a28d612f35a97
  3. Affected versionversion=f2b79c0d79683d552369bb9a7282c1f0226fc566 <89a4ae32764172468dea303eb6ae90fe6c859712
  4. Affected versionversion=f2b79c0d79683d552369bb9a7282c1f0226fc566 <9c914b7a0bd18834505c65f22225ce22c152b2d9
  5. Affected versionversion=f2b79c0d79683d552369bb9a7282c1f0226fc566 <b96be860673f9fbbf12cdadb0b25fc4d6d4d207f
  6. Affected versionversion=f2b79c0d79683d552369bb9a7282c1f0226fc566 <e163c7184acf36ac20a248498f4a16016057ca01

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=f2b79c0d79683d552369bb9a7282c1f0226fc566 <7968852a7ca3ce81477ec5b4494a28d612f35a97; version=f2b79c0d79683d552369bb9a7282c1f0226fc566 <89a4ae32764172468dea303eb6ae90fe6c859712; version=f2b79c0d79683d552369bb9a7282c1f0226fc566 <9c914b7a0bd18834505c65f22225ce22c152b2d9; version=f2b79c0d79683d552369bb9a7282c1f0226fc566 <b96be860673f9fbbf12cdadb0b25fc4d6d4d207f; version=f2b79c0d79683d552369bb9a7282c1f0226fc566 <e163c7184acf36ac20a248498f4a16016057ca01

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)
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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