EUVD-2026-14383
GHSA-hv7f-mhvh-6mf6
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Lifecycle Timeline
4Tags
Description
Any guest issuing a Xenstore command accessing a node using the (illegal) node path "/local/domain/", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path. Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path "/local/domain/" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.
Analysis
Xenstored on Ubuntu and Debian crashes when a guest VM submits a Xenstore command with an illegal node path "/local/domain/", causing a denial of service to that hypervisor component. An unprivileged guest can trigger this crash via a forced assert() statement, or if the service is built without debugging symbols, cause xenstored to consume excessive CPU resources while becoming unresponsive to further requests. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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Priority Score
Vendor Status
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| xenial | needs-triage | - |
| bionic | needs-triage | - |
| focal | needs-triage | - |
| jammy | needs-triage | - |
| noble | needs-triage | - |
| questing | needs-triage | - |
| upstream | needs-triage | - |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | (unfixed) | end-of-life |
| bullseye (security) | vulnerable | 4.14.5+94-ge49571868d-1 | - |
| bookworm, bookworm (security) | fixed | 4.17.5+72-g01140da4e8-1 | - |
| trixie | vulnerable | 4.20.2+37-g61ff35323e-0+deb13u1 | - |
| trixie (security) | vulnerable | 4.20.2+7-g1badcf5035-0+deb13u1 | - |
| forky, sid | vulnerable | 4.20.2+37-g61ff35323e-1 | - |
| bookworm | not-affected | - | - |
| (unstable) | fixed | (unfixed) | unimportant |
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External POC / Exploit Code
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