Bug 1972265 (CVE-2021-34693) - CVE-2021-34693 kernel: allows local users to obtain sensitive information from stack memory because of uninitialized data structure in net/can/bcm.c
Summary: CVE-2021-34693 kernel: allows local users to obtain sensitive information fro...
Keywords:
Status: NEW
Alias: CVE-2021-34693
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 1972267 1973498 1973499 1973500 1986334
Blocks: 1972269
TreeView+ depends on / blocked
 
Reported: 2021-06-15 14:34 UTC by Guilherme de Almeida Suckevicz
Modified: 2023-09-19 14:13 UTC (History)
37 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-06-15 14:34:32 UTC 
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.

Reference:
https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076@3c-app-gmx-bs04/T/
Comment 1 Guilherme de Almeida Suckevicz 2021-06-15 14:35:14 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1972267]
Comment 6 Justin M. Forbes 2021-06-29 16:27:24 UTC 
This was fixed for Fedora with the 5.12.13 stable kernel updates.
Note You need to log in before you can comment on or make changes to this bug.