CVE-2021-3491
CVSS V2 High 7.2
CVSS V3 High 8.8
Description
The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).
Overview
- CVE ID
- CVE-2021-3491
- Assigner
- security@ubuntu.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-06-04T02:15:07
- Last Modified Date
- 2021-09-14T14:31:37
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 1 | OR | 5.7 | 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: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:C/C:H/I:H/A:H
- Attack Vector
- LOCAL
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 8.8
- Base Severity
- HIGH
- Exploitability Score
- 2
- Impact Score
- 6
References
| Reference URL | Reference Tags |
|---|---|
| https://ubuntu.com/security/notices/USN-4949-1 | Third Party Advisory |
| https://ubuntu.com/security/notices/USN-4950-1 | Third Party Advisory |
| https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db | Patch Vendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-589/ | Third Party Advisory VDB Entry |
| https://www.openwall.com/lists/oss-security/2021/05/11/13 | Mailing List Patch Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20210716-0004/ | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-3491 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3491 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:05:33 | Added to TrackCVE | |||
| 2022-12-05 03:32:55 | 2021-06-04T02:15Z | 2021-06-04T02:15:07 | CVE Published Date | updated |
| 2022-12-05 03:32:55 | 2021-09-14T14:31:37 | CVE Modified Date | updated | |
| 2022-12-05 03:32:55 | Analyzed | Vulnerability Status | updated |