Unknown

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

In the Linux kernel, the following vulnerability has been resolved: KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure In kvmppc_svm_page_in(), if uv_page_in() fails after kvmppc_uvmem_get_page() has succeeded, the secure device page is never released. kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap, allocates a kvmppc_uvmem_page_pvt struct, marks the GFN as KVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets refcount=1 and locks the page. The subsequent goto out_finalize skips the *mig.dst assignment, so migrate_vma_finalize() is a no-op for the page, and none of those resources are ever reclaimed. Each occurrence permanently consumes one entry from the firmware-bounded secure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN marked as secure — making it unusable for the lifetime of the VM. The twin __kvmppc_svm_page_out() already handles the analogous uv_page_out() failure correctly with unlock_page(dpage); __free_page(dpage). Apply the same pattern here: unlock_page() followed by put_page(), which chains through free_zone_device_folio() into kvmppc_uvmem_folio_free() to clear the bitmap bit, free pvt, and reset the GFN state. Reachable whenever uv_page_in() returns an error (e.g. UV pool exhaustion) on any POWER9/10 + Ultravisor/PEF system.

Published Oct 18, 2026 · Updated Oct 18, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

No scoring signals.

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < ed2f2ff63cb7e71204096e765c6d02c3b6974b95≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < 8f3b7746874b39fc20e0363c9076c7787d4765ba≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < a933d7024359e2e566b07903d1294b84f90482ae≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < c41088b2765af1e97e7bb05f906ae1823eca0388≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < dfb84274932737e338ff5eb27f34b4c8ecb01b50≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < fcbff8008b0e08cd53b611bd0ff7e01f5b962f80≥ ca9f4942670c37407bb109090eaf776ce2ccc54c and < 0a416ee20bcccddf91ca5b63696a23b9d11d73aa and 1 more version 5.5	Vulnerable	CVE Program (cve.org) e CISA ADP

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 18, 2026
Affected products added · linux/linux
Oct 18, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 18, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 18, 2026 · Alertas do Telegram
CVE published
Oct 18, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 18, 2026 – Oct 18, 2026
1× Official description updated · Oct 18, 2026 – Oct 18, 2026

References

8 on the record

git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa
NIST National Vulnerability Database
git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95
NIST National Vulnerability Database
git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388
NIST National Vulnerability Database
git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba
NIST National Vulnerability Database
git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80
NIST National Vulnerability Database
git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
NIST National Vulnerability Database
git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae
NIST National Vulnerability Database
git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 14h
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 14h
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 14h
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 14h
Unknown CVE-2026-98857 ipvs: bound LBLCR and LBLC cache growth 14h
Unknown CVE-2026-98858 io_uring: fix task_work add use-after-free with SQPOLL 14h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98433 is "KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.