CVE-2021-3490
CVSS V2 High 7.2
CVSS V3 High 7.8
Description
The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).
Overview
- CVE ID
- CVE-2021-3490
- Assigner
- security@ubuntu.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-06-04T02:15:07
- Last Modified Date
- 2021-09-14T14:31:03
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 1 | OR | 5.10 | 5.10.37 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 1 | OR | 5.11 | 5.11.21 |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 1 | OR | 5.12 | 5.12.4 |
| cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:* | 1 | OR |
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://ubuntu.com/security/notices/USN-4949-1 | Third Party Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-606/ | Third Party Advisory VDB Entry |
| https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=049c4e13714ecbca567b4d5f6d563f05d431c80e | Patch Vendor Advisory |
| https://ubuntu.com/security/notices/USN-4950-1 | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2021/05/11/11 | Mailing List Patch Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20210716-0004/ | Third Party Advisory |
| http://packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.html | Exploit Third Party Advisory VDB Entry |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-3490 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3490 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:05:33 | Added to TrackCVE | |||
| 2022-12-05 03:32:50 | 2021-06-04T02:15Z | 2021-06-04T02:15:07 | CVE Published Date | updated |
| 2022-12-05 03:32:50 | 2021-09-14T14:31:03 | CVE Modified Date | updated | |
| 2022-12-05 03:32:50 | Analyzed | Vulnerability Status | updated |