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CVE-2026-79607

Xenstore: Guests can crash xenstored during Live Update

Medium5.5EPSS 0.12%
Published
Updated
Reserved
Assigned by
XEN

Description

During Xenstore live update the state record for a Xenstore watch with specified watch depth is written with two bytes missing. This results in an inconsistent state when reading the state back in the new Xenstore, causing a crash of Xenstore or wrong Xenstore data.

Scores

CVSS scores of CVE-2026-79607, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Awaiting Analysis3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.12% · top 98% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

  • Xen · Xen

    • unknown consult Xen advisory XSA-514

What to do

Workaround: Not doing a live update of Xenstore avoids the vulnerability. Switching to oxenstored avoids the vulnerability.

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .