CVE-2021-3492
CVSS V2 High 7.2
CVSS V3 High 7.8
Description
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.
Overview
- CVE ID
- CVE-2021-3492
- Assigner
- security@ubuntu.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-04-17T05:15:13
- Last Modified Date
- 2021-05-21T16:08:32
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* | 1 | OR | 18.04 | |
| cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* | 1 | OR | 18.04.1 | 20.04 |
| cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:* | 1 | OR | 20.10 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:C/I:C/A:C
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- COMPLETE
- Integrity Impact
- COMPLETE
- Availability Impact
- COMPLETE
- Base Score
- 7.2
- Severity
- HIGH
- Exploitability Score
- 3.9
- Impact Score
- 10
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- LOCAL
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 7.8
- Base Severity
- HIGH
- Exploitability Score
- 1.8
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| 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 |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-3492 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3492 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:15:18 | Added to TrackCVE | |||
| 2022-12-06 02:04:36 | 2021-04-17T05:15Z | 2021-04-17T05:15:13 | CVE Published Date | updated |
| 2022-12-06 02:04:36 | 2021-05-21T16:08:32 | CVE Modified Date | updated | |
| 2022-12-06 02:04:36 | Analyzed | Vulnerability Status | updated | |
| 2022-12-06 02:04:37 | CWE-401 | Weakness Enumeration | updated |