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ubuntucveUbuntu.comUB:CVE-2020-27171
HistoryMar 18, 2021 - 12:00 a.m.

CVE-2020-27171

2021-03-1800:00:00
ubuntu.com
ubuntu.com
31

CVSS2

3.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

6

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.001

Percentile

16.0%

An issue was discovered in the Linux kernel before 5.11.8.
kernel/bpf/verifier.c has an off-by-one error (with a resultant integer
underflow) affecting out-of-bounds speculation on pointer arithmetic,
leading to side-channel attacks that defeat Spectre mitigations and obtain
sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

Notes

Author Note
alexmurray According to the upstream advisory, 10d2bb2e6b1d8c4576c56a748f697dbeb8388899 is the minimal fix but the whole series should be applied together

CVSS2

3.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

CVSS3

6

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.001

Percentile

16.0%