What’s Vulnerable › Vulnerabilities

CVE-2022-23033

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-25 · updated 2026-06-17
• Weakness: CWE-404

Description

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.

Affected products

• Debian Linux: 11.0
• Fedoraproject Fedora: 34
• xen: from 4.12.0

References

• http://www.openwall.com/lists/oss-security/2022/01/25/2
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23
• https://www.debian.org/security/2022/dsa-5117
• https://xenbits.xenproject.org/xsa/advisory-393.txt
• http://www.openwall.com/lists/oss-security/2022/01/25/2
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
• https://security.gentoo.org/glsa/202208-23
• https://www.debian.org/security/2022/dsa-5117
• https://xenbits.xenproject.org/xsa/advisory-393.txt

Get alerted when CVE-2022-23033 or the next vulnerability affects your stack