CVE-2021-4095

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-4095
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

1.9 /10

CVSS v2.0 : LOW

V2 Legend

Vector : AV:L/AC:M/Au:N/C:N/I:N/A:P

Exploitability : 3.4 / Impact : 2.9

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
http://www.openwall.com/lists/oss-security/2022/01/17/1 Exploit Mailing List Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2031194 Exploit Issue Tracking Patch Third Party Advisory
https://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/
Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
History

07 Nov 2023, 03:40

Type Values Removed Values Added
References
  • {'url': 'https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/', 'name': 'FEDORA-2022-8efcea6e67', 'tags': ['Mailing List', 'Third Party Advisory'], 'refsource': 'FEDORA'}
  • {'url': 'https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/', 'name': 'FEDORA-2022-0816754490', 'tags': ['Mailing List', 'Third Party Advisory'], 'refsource': 'FEDORA'}
  • () https://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/ -

28 Jul 2022, 18:01

Type Values Removed Values Added
References (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/ - (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/ - Mailing List, Third Party Advisory
References (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/ - (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/ - Mailing List, Third Party Advisory
CPE cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

24 Apr 2022, 22:15

Type Values Removed Values Added
References
  • (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VT6573CGKVK3DU2632VVO5BVM4IU7SBV/ -
  • (FEDORA) https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QIOQN7JJNN6ABIDGRSTVZA65MHRLMH2Q/ -

15 Mar 2022, 18:00

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : 1.9
v3 : 5.5
CPE cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Fedoraproject fedora
Linux
Fedoraproject
CWE CWE-476
References (MLIST) http://www.openwall.com/lists/oss-security/2022/01/17/1 - (MLIST) http://www.openwall.com/lists/oss-security/2022/01/17/1 - Exploit, Mailing List, Patch, Third Party Advisory
References (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=2031194 - (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=2031194 - Exploit, Issue Tracking, Patch, Third Party Advisory

10 Mar 2022, 17:54

Type Values Removed Values Added
New CVE
Information

Published : 2022-03-10 17:44

Updated : 2023-12-10 14:22

NVD link : CVE-2021-4095

Mitre link : CVE-2021-4095

CVE.ORG link : CVE-2021-4095

JSON object : View

Products Affected

linux

  • linux_kernel

fedoraproject

  • fedora
CWE
CWE-476

NULL Pointer Dereference