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CVE-2021-4095

Date: March 10, 2022

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 prior to 5.17-rc1.

Severity Score

Related Resources (9)

https://nvd.nist.gov/vuln/detail/CVE-2021-4095
http://www.openwall.com/lists/oss-security/2022/01/17/1
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/
https://access.redhat.com/security/cve/CVE-2021-4095
https://security-tracker.debian.org/tracker/CVE-2021-4095
https://bugzilla.redhat.com/show_bug.cgi?id=2031194
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4095
https://www.mend.io/vulnerability-database/CVE-2021-4095

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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