CVE Vulnerability

CVE-2021-3492

Shiftfs, an out-of-tree stacking file system included in Ubuntu Linux kernels, did not properly handle faults occurring during copy_from_user() correctly. These could lead to either a double-free situation or memory not being freed at all. An attacker could use this to cause a denial of service (kernel memory exhaustion) or gain privileges via executing arbitrary code. AKA ZDI-CAN-13562.

7.2 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 10

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

Scope

7.8 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://www.openwall.com/lists/oss-security/2021/04/16/2 Mailing List Third Party Advisory
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=25c891a949bf918b59cbc6e4932015ba4c35c333 Mailing List Patch
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6 Mailing List Patch
https://ubuntu.com/security/notices/USN-4917-1 Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-422/ Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/162614/Kernel-Live-Patch-Security-Notice-LSN-0077-1.html Third Party Advisory VDB Entry
Configurations

Configuration 1

cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:*
Information

Published : 2021-04-17 05:15

Updated : 2021-05-21 04:08

NVD link : CVE-2021-3492

Mitre link : CVE-2021-3492

Products Affected
No products.
CWE
CWE-401

CWE-415