HighFix available
xen — security advisory
An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/ are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.
- Products
- xen
- Affected versions
- Not specified
- Fixed versions
- 4.13.2-r3, 4.14.1-r0
- CVEs
- CVE-2020-29481
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:09 UTC · Revision 1
Source evidence
An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/ are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.
osv:ALPINE-CVE-2020-29481
xen
Fixed versions: 4.13.2-r3
xen
Fixed versions: 4.13.2-r3
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
xen
Fixed versions: 4.14.1-r0
Complete source record
{
"id": "f6f4c4bac36ec04cff5fe8ca9481359ef0f8d55b0defd2f9b3f6863be1891913",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-29481",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-29481",
"summary": "An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/ are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.",
"evidence": "osv:ALPINE-CVE-2020-29481",
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"severity": "high",
"structured": {
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"aliases": [
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],
"modified": "2026-10-26T11:17:55.168259373Z",
"provider": "osv",
"upstream": [
"CVE-2020-29481"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-29481"
]
},
"related_cves": [
{
"value": "CVE-2020-29481",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450605,
"published_at": "2020-12-15T18:15:15.067+00:00"
}