PT-2021-4222 · Linux+5 · Linux Kernel+5

Norbert Slusarek · Published 2021-06-13 · Updated 2025-09-29 · CVE-2021-34693

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel versions through 5.12.10

Description The issue allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized. This is due to a lack of initialization of a certain data structure in the net/can/bcm.c component of the Linux kernel.

Recommendations For Linux kernel versions through 5.12.10, update to a version later than 5.12.10 to resolve the issue.

Exploit

Fix

Weakness Enumeration

CWE-909

Related Identifiers

ALSA-2025_16880

ALT-PU-2021-2025

ALT-PU-2021-2026

ALT-PU-2021-2315

ALT-PU-2021-2326

ALT-PU-2021-2330

ALT-PU-2021-3481

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

AZL-6567

BDU:2021-04826

CVE-2021-34693

DLA-2713-1

DLA-2713-2

DLA-2714-1

DSA-4941-1

MGASA-2021-0295

MGASA-2021-0296

OESA-2021-1279

OPENSUSE-SU-2021:2305-1

OPENSUSE-SU-2021:2352-1

OPENSUSE-SU-2021:2427-1

OPENSUSE-SU-2021_2305-1

OPENSUSE-SU-2021_2352-1

OPENSUSE-SU-2021_2427-1

SUSE-SU-2021:14764-1

SUSE-SU-2021:2303-1

SUSE-SU-2021:2305-1

SUSE-SU-2021:2321-1

SUSE-SU-2021:2324-1

SUSE-SU-2021:2325-1

SUSE-SU-2021:2349-1

SUSE-SU-2021:2352-1

SUSE-SU-2021:2406-1

SUSE-SU-2021:2421-1

SUSE-SU-2021:2422-1

SUSE-SU-2021:2426-1

SUSE-SU-2021:2427-1

SUSE-SU-2021:2451-1

SUSE-SU-2021_14764-1

USN-5045-1

USN-5070-1

USN-5073-1

USN-5073-2

USN-5073-3

USN-5299-1

USN-5343-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Linux Kernel

Suse

Ubuntu

References · 406

• 🔥 https://github.com/nrb547/kernel-exploitation/tree/main/cve-2021-34693 · Exploit
• 🔥 http://openwall.com/lists/oss-security/2021/06/15/1 · Exploit
• 🔥 https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076@3c-app-gmx-bs04/T · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2021:2305-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-38208 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-34693 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:2451-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-38160 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-42008 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2021-0295 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-29650 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-43389 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3573 · Security Note
• https://ubuntu.com/security/CVE-2021-3679 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-28972 · Vendor Advisory