VulnerabilityPublished 18 Oct 2026

CVE-2026-98863: Linux kernel · KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

Source GCVE Database

Authoritative record:CVE-2026-98863· Medium

Not known to be exploited · fixed in 942192dbcd3a06695ef6b31cf10a41a21cf014d8 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 16:00 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 942192dbcd3a06695ef6b31cf10a41a21cf014d8, 525694a6021ec6c8f7ce1f38acdf2dd77698fec1, 10180a277549339020b08000206092c07e0bff5a

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-8v5w-2f74-jcch

What to do

Upgrade Linux kernel to 942192dbcd3a06695ef6b31cf10a41a21cf014d8, 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 or 10180a277549339020b08000206092c07e0bff5a.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 671ddc700fd08b94967b1e2a937020e30c838609, < 942192dbcd3a06695ef6b31cf10a41a21cf014d8	Fixed in 942192dbcd3a06695ef6b31cf10a41a21cf014d8
LinuxLinux	Affected ≥ 671ddc700fd08b94967b1e2a937020e30c838609, < 525694a6021ec6c8f7ce1f38acdf2dd77698fec1	Fixed in 525694a6021ec6c8f7ce1f38acdf2dd77698fec1
LinuxLinux	Affected ≥ 671ddc700fd08b94967b1e2a937020e30c838609, < 10180a277549339020b08000206092c07e0bff5a	Fixed in 10180a277549339020b08000206092c07e0bff5a
LinuxLinux	Affected =5.4	Fixed in–
Debiandebian/linux`pkg:deb/debian/linux`Other threats	Affected =5.4	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to re-pend GET_NESTED_STATE_PAGES if fetching nested pages fails, preventing stale PFNs from being reused. Both SVM and VMX implementations clear the request on VM-Exit to avoid double-mapping. Users should update to the patched Linux kernel version containing this fix. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's KVM x86 virtualization component was resolved involving the handling of nested state pages. If the retrieval of nested pages fails during the KVM_RUN path, stale and unpinned page frame numbers (PFNs) from a previous nested run could be reused, potentially causing incorrect memory mappings such as the vAPIC page. Both SVM and VMX implementations have safeguards to clear the request on VM-Exit, preventing double-mapping issues.

References

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