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cve[email protected]CVE-2021-31829
HistoryMay 06, 2021 - 4:15 p.m.

CVE-2021-31829

2021-05-0616:15:07
CWE-863
[email protected]
web.nvd.nist.gov
171
6
cve-2021-31829
linux kernel
speculative load
disclosure
stack content
side-channel attacks
cid-801c6058d14a
bpf stack
uninitialized data
nvd

2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

5.9 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

16.4%

JSON

kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel.

Affected configurations

NVD
Node
linuxlinux_kernelRange≤5.12.1
Node
fedoraprojectfedoraMatch32
OR
fedoraprojectfedoraMatch33
OR
fedoraprojectfedoraMatch34
Node
debiandebian_linuxMatch9.0

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2.1 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

5.9 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

16.4%

JSON
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