CVE-2021-21781
CVSS V2 Low 2.1
CVSS V3 Low 3.3
Description
An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11
Overview
- CVE ID
- CVE-2021-21781
- Assigner
- talos-cna@cisco.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-08-18T15:15:07
- Last Modified Date
- 2023-02-03T14:31:55
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:5.4.54:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.4.66:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:L/AC:L/Au:N/C:P/I:N/A:N
- Access Vector
- LOCAL
- Access Compatibility
- LOW
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 2.1
- Severity
- LOW
- Exploitability Score
- 3.9
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Attack Vector
- LOCAL
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- LOW
- Availability Impact
- NONE
- Base Score
- 3.3
- Base Severity
- LOW
- Exploitability Score
- 1.8
- Impact Score
- 1.4
References
| Reference URL | Reference Tags |
|---|---|
| https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243 | Exploit Third Party Advisory |
| https://www.oracle.com/security-alerts/cpujul2022.html |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21781 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21781 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-04-20 17:02:00 | Added to TrackCVE | |||
| 2022-12-05 08:31:08 | 2021-08-18T15:15Z | 2021-08-18T15:15:07 | CVE Published Date | updated |
| 2022-12-05 08:31:08 | 2022-07-25T18:15:35 | CVE Modified Date | updated | |
| 2022-12-05 08:31:08 | Undergoing Analysis | Vulnerability Status | updated | |
| 2022-12-05 08:31:12 | References | updated | ||
| 2023-02-03 15:11:48 | 2023-02-03T14:31:55 | CVE Modified Date | updated | |
| 2023-02-03 15:11:48 | Undergoing Analysis | Analyzed | Vulnerability Status | updated |