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CVE-2021-34693

kernel: allows local users to obtain sensitive information from stack memory because of uninitialized data structure in net/can/bcm.c

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Severity

Moderate

Red Hat Product Security

4

CVSS 3.1

Review impact separately from score.

Published · June 12, 2021

Updated · October 9, 2026

Description

The canbus filesystem in the Linux kernel contains an information leak of kernel memory to devices on the CAN bus network link layer. An attacker with the ability to dump messages on the CAN bus is able to learn of uninitialized stack values by dumbing messages on the can bus.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 4
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-908 · Use of Uninitialized Resource