CVE-2022-23034
A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled.
Does this matter?
Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own.
Description
A PV guest could DoS Xen while unmapping a grant To address XSA-380, reference counting was introduced for grant mappings for the case where a PV guest would have the IOMMU enabled. PV guests can request two forms of mappings. When both are in use for any individual mapping, unmapping of such a mapping can be requested in two steps. The reference count for such a mapping would then mistakenly be decremented twice. Underflow of the counters gets detected, resulting in the triggering of a hypervisor bug check.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-191
- Affected
- xen/xen · fedoraproject/fedora · debian/debian linux
- Source
- security@xen.org
References
- http://www.openwall.com/lists/oss-security/2022/01/25/3Mailing List, 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-394.txtPatch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2022/01/25/3Mailing List, 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-394.txtPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.