VulnerabilityPublished 18 Oct 2026

CVE-2026-98433: Linux kernel · KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure

Source GCVE Database

Authoritative record:CVE-2026-98433· Medium

Not known to be exploited · fixed in fcbff8008b0e08cd53b611bd0ff7e01f5b962f80 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fcbff8008b0e08cd53b611bd0ff7e01f5b962f80, f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b, ed2f2ff63cb7e71204096e765c6d02c3b6974b95 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-3v64-xhg6-868f

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < fcbff8008b0e08cd53b611bd0ff7e01f5b962f80	Fixed in fcbff8008b0e08cd53b611bd0ff7e01f5b962f80
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b	Fixed in f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < ed2f2ff63cb7e71204096e765c6d02c3b6974b95	Fixed in ed2f2ff63cb7e71204096e765c6d02c3b6974b95
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < dfb84274932737e338ff5eb27f34b4c8ecb01b50	Fixed in dfb84274932737e338ff5eb27f34b4c8ecb01b50
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < c41088b2765af1e97e7bb05f906ae1823eca0388	Fixed in c41088b2765af1e97e7bb05f906ae1823eca0388
LinuxLinux	Affected ≥ ca9f4942670c37407bb109090eaf776ce2ccc54c, < a933d7024359e2e566b07903d1294b84f90482ae	Fixed in a933d7024359e2e566b07903d1294b84f90482ae

AI-suggested

A fix is available that applies proper resource cleanup on uv_page_in() failure by unlocking and releasing the page, preventing the secure device page leak. Users should apply the official Linux kernel patch that addresses this issue. Since this is a kernel-level vulnerability, upgrading to a patched kernel version is the recommended remediation. No alternative mitigations are indicated.

Description

A vulnerability in the Linux kernel's KVM PPC Book3S HV subsystem causes a secure device page leak when uv_page_in() fails during kvmppc_svm_page_in(). This leak permanently consumes an entry from the secure memory pool, leaks memory structures, and marks the guest frame number as secure and unusable for the VM's lifetime. The issue affects POWER9/10 systems running Ultravisor/PEF and is triggered by uv_page_in() errors such as UV pool exhaustion. The problem is fixed by applying the same resource cleanup pattern used in a related function, ensuring proper release of locked pages and memory structures.

Impact

The vulnerability causes a permanent leak of secure device pages and associated memory structures in the secure memory pool, reducing available secure memory and rendering certain guest frame numbers unusable for the lifetime of the affected virtual machine. This can degrade system stability and resource availability on POWER9/10 systems running Ultravisor/PEF. There is no indication of remote code execution or privilege escalation from the provided data.

References

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