CVEvulnerability
CVE-2026-23554
7.8 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-03-23
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.8 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-367
Description
The Intel EPT paging code uses an optimization to defer flushing of any cached
EPT state until the p2m lock is dropped, so that multiple modifications done
under the same locked region only issue a single flush.
Freeing of paging structures however is not deferred until the flushing is
done, and can result in freed pages transiently being present in cached state.
Such stale entries can point to memory ranges not owned by the guest, thus
allowing access to unintended memory regions.
Affected configurations
• xen xen (>= 4.17)
Related
Weakness · CWE (1)
- CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness
References
- https://xenbits.xenproject.org/xsa/advisory-480.html Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/03/17/6 Mailing List, Patch, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-480.html Patch, Vendor Advisory