HighFix available
xen — security advisory
arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.
- Products
- xen
- Affected versions
- Not specified
- Fixed versions
- 4.13.4-r3, 4.14.5-r0, 4.15.2-r0, 4.16.1-r0
- CVEs
- CVE-2022-23033
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 14:10 UTC · Revision 1
Source evidence
arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.
osv:ALPINE-CVE-2022-23033
xen
Fixed versions: 4.13.4-r3
xen
Fixed versions: 4.14.5-r0
xen
Fixed versions: 4.15.2-r0
xen
Fixed versions: 4.15.2-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
xen
Fixed versions: 4.16.1-r0
Complete source record
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"url": "https://osv.dev/vulnerability/ALPINE-CVE-2022-23033",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2022-23033",
"summary": "arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.",
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"severity": "high",
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"aliases": [
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"metrics": [
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],
"modified": "2026-10-15T07:17:54.164561938Z",
"provider": "osv",
"upstream": [
"CVE-2022-23033"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2022-23033"
]
},
"related_cves": [
{
"value": "CVE-2022-23033",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 321697,
"published_at": "2022-01-25T14:15:08.967+00:00"
}