CVE-2021-3490
Published Jun 4, 2021
Last updated 3 years ago
Overview
- 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).
- Source
- security@ubuntu.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 7.8
- Impact score
- 5.9
- Exploitability score
- 1.8
- Vector string
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Severity
- HIGH
CVSS 2.0
- Type
- Primary
- Base score
- 7.2
- Impact score
- 10
- Exploitability score
- 3.9
- Vector string
- AV:L/AC:L/Au:N/C:C/I:C/A:C
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "4E433B72-3E3A-435E-9A66-80D28868BDF2",
"versionEndExcluding": "5.10.37",
"versionStartIncluding": "5.10"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8CBB94EC-EC33-4464-99C5-03E5542715F0",
"versionEndExcluding": "5.11.21",
"versionStartIncluding": "5.11"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838",
"versionEndExcluding": "5.12.4",
"versionStartIncluding": "5.12"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:-:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8F0E7012-0BA3-4E6A-ADE9-57973CBDEE28"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532"
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
"vulnerable": true,
"matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB"
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "338B3AAC-C147-4A31-95E7-6E8A6FB4B3FC"
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "8EF1C1CC-3FAE-4DE3-BC41-E5B14D5721F4"
}
],
"operator": "OR"
}
]
}
]