CVE-2026-98433

Secure-memory exhaustion via page-in failure cleanup omission

Published Oct 18, 2026 · Updated Oct 18, 2026

A memory leak in Linux PowerPC KVM allows attackers to consume secure-memory capacity via failed Ultravisor page-in operations. In kvmppc_svm_page_in(), the uv_page_in() error path skips destination-page registration and release, preventing migration finalization from reclaiming the allocated page. The path requires POWER9/10 with Ultravisor/PEF; each failure consumes a pool entry and leaves a guest page unusable for the VM's lifetime, but attacker control of these errors is undocumented.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in Linux PowerPC KVM allows attackers to consume secure-memory capacity via failed Ultravisor page-in operations. In kvmppc_svm_page_in(), the uv_page_in() error path skips destination-page registration and release, preventing migration finalization from reclaiming the allocated page. The path requires POWER9/10 with Ultravisor/PEF; each failure consumes a pool entry and leaves a guest page unusable for the VM's lifetime, but attacker control of these errors is undocumented.

The record

CVE
CVE-2026-98433
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=5.5
  2. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <0a416ee20bcccddf91ca5b63696a23b9d11d73aa
  3. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <8f3b7746874b39fc20e0363c9076c7787d4765ba
  4. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <a933d7024359e2e566b07903d1294b84f90482ae
  5. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <c41088b2765af1e97e7bb05f906ae1823eca0388
  6. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <dfb84274932737e338ff5eb27f34b4c8ecb01b50
  7. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <ed2f2ff63cb7e71204096e765c6d02c3b6974b95
  8. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
  9. Affected versionversion=ca9f4942670c37407bb109090eaf776ce2ccc54c <fcbff8008b0e08cd53b611bd0ff7e01f5b962f80

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <0a416ee20bcccddf91ca5b63696a23b9d11d73aa; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <8f3b7746874b39fc20e0363c9076c7787d4765ba; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <a933d7024359e2e566b07903d1294b84f90482ae; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <c41088b2765af1e97e7bb05f906ae1823eca0388; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <dfb84274932737e338ff5eb27f34b4c8ecb01b50; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <ed2f2ff63cb7e71204096e765c6d02c3b6974b95; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b; version=ca9f4942670c37407bb109090eaf776ce2ccc54c <fcbff8008b0e08cd53b611bd0ff7e01f5b962f80

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.

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

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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