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8.8
Xen shadow mode may expose virtual machine data
published 4 days ago
Summary
The Xen virtualization software can fail to clear a memory cache when certain virtual machines run in a special shadow paging mode. This could allow one guest system to see data from another guest. Update Xen to the latest release that fixes the cache‑clearing error.
What to do
- Update cleanstart xen to version 4.16.1-r6.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | xen |
< 4.16.1-r6 Fix: upgrade to 4.16.1-r6
|
Original advisory text
insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode
Security vulnerability affects the xen package. insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode.
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published31 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-ZD40910 · OSV
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