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.

CVSS v3.0 7.8 HIGH
CVSS v2.0 7.2 HIGH

7.8^/10

CVSS v3.0 : HIGH

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

7.2^/10

CVSS v2.0 : HIGH

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

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

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 Vendor Advisory
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/commit/?id=8fee52ab9da87d82bc6de9ebb3480fff9b4d53e6	Mailing List Patch Vendor Advisory
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

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:::::lts:::*
	cpe:2.3:o:canonical:ubuntu_linux:::::lts:::*

Configuration 2 (hide)

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

Information

Published : 2021-04-16 22:15

Updated : 2021-05-21 09:08

NVD link : CVE-2021-3492

Mitre link : CVE-2021-3492

JSON object : View

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

CWE-415

Double Free

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Products Affected

canonical

ubuntu_linux

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