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CVE-2021-31829

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Date: May 6, 2021

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.

Language: C

Severity Score

Related Resources (14)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZI7OBCJQDNWMKLBP6MZ5NV4EUTDAMX6Q/
http://www.openwall.com/lists/oss-security/2021/05/04/4
https://github.com/torvalds/linux/commit/801c6058d14a82179a7ee17a4b532cac6fad067f
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VWCZ6LJLENL2C3URW5ICARTACXPFCFN2/
https://access.redhat.com/security/cve/CVE-2021-31829
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZI7OBCJQDNWMKLBP6MZ5NV4EUTDAMX6Q/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y4X2G5YAPYJGI3PFEZZNOTRYI33GOCCZ/
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y4X2G5YAPYJGI3PFEZZNOTRYI33GOCCZ/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-31829
https://nvd.nist.gov/vuln/detail/CVE-2021-31829
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VWCZ6LJLENL2C3URW5ICARTACXPFCFN2/
https://security-tracker.debian.org/tracker/CVE-2021-31829
https://www.mend.io/vulnerability-database/CVE-2021-31829

Severity Score

Weakness Type (CWE)

Incorrect Authorization

CWE-863

Top Fix

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Upgrade Version

Upgrade to version linux-libc-headers - 5.8;linux-libc-headers - 5.13

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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