CVE-2022-23033

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.

• CWE-404

• https://www.openwall.com/lists/oss-security/2022/01/25/2Mailing List, Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23Third Party Advisory
• https://www.debian.org/security/2022/dsa-5117Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-393.txtVendor Advisory
• https://www.openwall.com/lists/oss-security/2022/01/25/2Mailing List, Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23Third Party Advisory
• https://www.debian.org/security/2022/dsa-5117Third Party Advisory
• https://xenbits.xenproject.org/xsa/advisory-393.txtVendor Advisory

Published

Jan 25, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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