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CVE-2021-34556

Public on 2021-08-02
Modified on 2021-08-05
Description

A flaw was found in the Linux kernel, where a BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack. This issue occurs when the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack. The highest threat from this vulnerability is to confidentiality.

Severity
Medium
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CVSS v3 Base Score
4.4
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core kernel 2021-08-04 20:32 ALAS2-2021-1696
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:43 ALAS2KERNEL-5.10-2022-004

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD CVSSv2 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Red Hat: CVE-2021-34556 Mitre: CVE-2021-34556 FAQs regarding Amazon Linux ALAS/CVE Severity