CVE-2026-98863: Linux kernel · KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 942192dbcd3a06695ef6b31cf10a41a21cf014d8 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated Medium by Threat Radar's AI analysis · 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.
What to do
Upgrade Linux kernel to 942192dbcd3a06695ef6b31cf10a41a21cf014d8, 525694a6021ec6c8f7ce1f38acdf2dd77698fec1 or 10180a277549339020b08000206092c07e0bff5a.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
Debiandebian/linuxpkg:deb/debian/linuxOther threats | Affected
| 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 is available and has been applied in the Linux kernel as indicated by the provided commit hashes. Users running affected versions, specifically Linux kernel 5.4, should update to a fixed version containing these commits to mitigate the issue. There is no indication that additional mitigation steps are required beyond applying the official fix.
Description
A vulnerability in the Linux kernel's KVM x86 virtualization subsystem was fixed where stale nested state pages could be re-used if getting nested pages failed, potentially causing stale, unpinned page frame numbers (PFNs) to be mapped during nested virtualization. This issue affected Linux kernel version 5.4. The fix ensures that the GET_NESTED_STATE_PAGES request is properly re-pended or cleared to prevent stale mappings.