CVE-2026-98653: Linux kernel · KVM: s390: Fix _gaccess_shadow_fault()
Affects Linux kernelSource CVE Database V5
Not known to be exploited : upgrade to faff4c8ff3dbec6d71b89dd281a0d17c4478fa44 or 94c43c7df46433ed4d1e18f13770b019ba977bd8 when convenient.
Data as of 26 Oct 2026, 11:07 UTC
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 faff4c8ff3dbec6d71b89dd281a0d17c4478fa44, 94c43c7df46433ed4d1e18f13770b019ba977bd8
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 faff4c8ff3dbec6d71b89dd281a0d17c4478fa44 or 94c43c7df46433ed4d1e18f13770b019ba977bd8.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A patch is available and has been applied in the Linux kernel versions identified by commits faff4c8ff3dbec6d71b89dd281a0d17c4478fa44 and 94c43c7df46433ed4d1e18f13770b019ba977bd8. Users should update to these fixed versions or later to remediate the issue. Since this is a kernel-level fix, applying the official kernel update is the recommended mitigation.
Description
A vulnerability in the Linux kernel's KVM s390 subsystem related to the _gaccess_shadow_fault() function has been fixed. The issue involved a scenario where a nested guest memory page being shadowed might not be present in the parent guest's gmap, causing dat_entry_walk() to fail and erroneously propagate an error to userspace. The fix involves manually linking the nested guest memory if the mapping was missing.