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5.5
CVSSv3

CVE-2021-4095

Published: 10/03/2022 Updated: 07/11/2023
CVSS v2 Base Score: 1.9 | Impact Score: 2.9 | Exploitability Score: 3.4
CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8
VMScore: 169
Vector: AV:L/AC:M/Au:N/C:N/I:N/A:P
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Vulnerability Summary

A NULL pointer dereference was found in the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context. An unprivileged local attacker on the host may use this flaw to cause a kernel oops condition and thus a denial of service by issuing a KVM_XEN_HVM_SET_ATTR ioctl. This flaw affects Linux kernel versions before 5.17-rc1.

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Vendor Advisories

Arch Linux Issues:
A security issue has been found in the Linux kernel There is a NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ringc via a KVM KVM_XEN_HVM_SET_ATTR ioctl when there is no vCPU created ...

Mailing Lists

Full Disclosure: Re: CVE-2021-4095: kernel: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ring.c
<!--X-Body-Begin--> <!--X-User-Header--> oss-sec mailing list archives <!--X-User-Header-End--> <!--X-TopPNI--> By Date By Thread </form> <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> Re: CVE-2021-4095: kernel: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ringc <!--X-Subject-Header ...

References

CWE-476https://bugzilla.redhat.com/show_bug.cgi?id=2031194http://www.openwall.com/lists/oss-security/2022/01/17/1https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/https://nvd.nist.govhttps://security.archlinux.org/CVE-2021-4095http://seclists.org/oss-sec/2022/q1/45
CVSSv3
CVSSv2
CVSSv3
VMScore
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