CVE-2021-34556

Aliases:UBUNTU-CVE-2021-34556DEBIAN-CVE-2021-34556
Advisory lineage Upstream: 0 Downstream: 33
Modified
Published: 02 Aug 2021, 04:02
Last modified:04 Aug 2024, 00:12

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.42% LOW
0% probability +0.38%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

02 Aug 2021, 04:02
Published
Vulnerability first disclosed
04 Aug 2024, 00:12
Last Modified
Vulnerability information updated

Description

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.42%• Percentile: 36%

Techniques & Countermeasures

  • CWE-203•Observable Discrepancy

    The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected Systems

  • debian•linux

    < 5.10.46-4 | < 5.10.46-4 | < 5.10.46-4 | < 5.10.46-4

  • ubuntu•linux

    all | < 5.4.0-90.101

  • ubuntu•linux-aws

    all | < 5.4.0-1059.62

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    < 5.11.0-1019.20~20.04.1

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1059.62~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-fips

    all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-aws-hwe

    all

  • ubuntu•linux-azure

    all | all | < 5.4.0-1063.66

  • ubuntu•linux-azure-4.15

    all

  • ubuntu•linux-azure-5.11

    < 5.11.0-1017.18~20.04.1

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1063.66~18.04.1

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde-5.15

    < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    all | < 5.4.0-1021.24

  • ubuntu•linux-fips

    all | < 5.4.0-1036.42

  • ubuntu•linux-gcp

    all | all | < 5.4.0-1057.61

  • ubuntu•linux-gcp-4.15

    all

  • ubuntu•linux-gcp-5.11

    < 5.11.0-1020.22~20.04.1

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1057.61~18.04.1

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    < 5.4.0-1055.58

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1055.58~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1026.27

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1026.27~18.04.1

  • ubuntu•linux-hwe

    all | all

  • ubuntu•linux-hwe-5.11

    < 5.11.0-37.41~20.04.2

  • ubuntu•linux-hwe-5.4

    < 5.4.0-90.101~18.04.1

  • ubuntu•linux-hwe-5.8

    all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-ibm

    < 5.4.0-1007.8

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    all | < 5.4.0-1049.51

  • ubuntu•linux-lts-xenial

    all

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.10

    < 5.10.0-1050.52

  • ubuntu•linux-oem-5.13

    < 5.13.0-1014.18

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle

    all | < 5.4.0-1057.61

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.11

    < 5.11.0-1019.20~20.04.1

Showing first 50 affected entries in server-rendered view.

References (16)