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ubuntucveUbuntu.comUB:CVE-2021-3600
HistoryJun 22, 2021 - 12:00 a.m.

CVE-2021-3600

2021-06-2200:00:00
ubuntu.com
ubuntu.com
24

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

6.3 Medium

AI Score

Confidence

High

4.3 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:S/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

5.3%

JSON

It was discovered that the eBPF implementation in the Linux kernel did not
properly track bounds information for 32 bit registers when performing div
and mod operations. A local attacker could use this to possibly execute
arbitrary code.

Notes

Author Note
sbeattie 4.15 kernels the only ubuntu kernels that have not yet had the fix applied for 4.15 kernels, f6b1b3bf0d5f (“bpf: fix subprog verifier bypass by div/mod by 0 exception”) is needed as a prerequisite but introduces CVE-2021-3444
cascardo Commit f1174f77b50c is also necessary to exploit, and is not present on 4.4 kernels.
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-147.151UNKNOWN
ubuntu20.04noarchlinux< 5.4.0-70.78UNKNOWN
ubuntu20.10noarchlinux< 5.8.0-48.54UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1106.113UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1041.43UNKNOWN
ubuntu20.10noarchlinux-aws< 5.8.0-1027.29UNKNOWN
ubuntu18.04noarchlinux-aws-5.4< 5.4.0-1041.43~18.04.1UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1106.113~16.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu20.04noarchlinux-azure< 5.4.0-1043.45UNKNOWN
ubuntu20.10noarchlinux-azure< 5.8.0-1026.28UNKNOWN
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7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

6.3 Medium

AI Score

Confidence

High

4.3 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:L/AC:L/Au:S/C:P/I:P/A:P

0.0004 Low

EPSS

Percentile

5.3%

JSON
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