PT-2021-4205 · Linux+9 · Linux Kernel+9

Yuan Ming · Published 2021-08-30 · Updated 2024-08-20 · CVE-2021-3753

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to a race problem in the vt k ioctl function in the Linux kernel, specifically in the drivers/tty/vt/vt ioctl.c file. This problem may cause an out of bounds read in vt due to the lack of protection by a lock for write access to vc mode in vt ioctl (KDSETMDE). The primary threat posed by this issue is to data confidentiality.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Race Condition

Weakness Enumeration

CWE-125

CWE-362

Related Identifiers

ALSA-2024:2950

ALSA-2024:3138

ALT-PU-2021-3330

ALT-PU-2021-3358

ALT-PU-2021-3563

ALT-PU-2021-3573

ALT-PU-2021-3660

ALT-PU-2022-1240

ALT-PU-2022-1327

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

ALT-PU-2023-4894

BDU:2021-04804

CESA-2024_2950

CESA-2024_3138

CVE-2021-3753

DLA-2785-1

DLA-2843-1

DSA-4978-1

INFSA-2024_2950

INFSA-2024_3138

MGASA-2021-0418

MGASA-2021-0419

OESA-2021-1453

OPENSUSE-SU-2021:1271-1

OPENSUSE-SU-2021:3179-1

OPENSUSE-SU-2021:3205-1

OPENSUSE-SU-2021:3876-1

OPENSUSE-SU-2021_1271-1

OPENSUSE-SU-2021_3179-1

OPENSUSE-SU-2021_3205-1

OPENSUSE-SU-2021_3876-1

OPENSUSE-SU-2024:10728-1

OPENSUSE-SU-2024:13704-1

RHSA-2024:2950

RHSA-2024:3138

RHSA-2024_2950

RHSA-2024_3138

RLSA-2024:2950

RLSA-2024:3138

SUSE-SU-2021:3177-1

SUSE-SU-2021:3178-1

SUSE-SU-2021:3179-1

SUSE-SU-2021:3192-1

SUSE-SU-2021:3205-1

SUSE-SU-2021:3205-2

SUSE-SU-2021:3206-1

SUSE-SU-2021:3207-1

SUSE-SU-2021:3217-1

SUSE-SU-2021:3415-1

SUSE-SU-2021:3876-1

SUSE-SU-2021:3929-1

SUSE-SU-2021:3935-1

SUSE-SU-2021:3969-1

SUSE-SU-2021:3972-1

SUSE-SU-2022:14905-1

SUSE-SU-2022_14905-1

USN-5113-1

USN-5115-1

USN-5117-1

USN-5136-1

USN-5137-1

USN-5137-2

USN-6221-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Linux Kernel

Red Hat

Rocky Linux

Suse

Ubuntu

References · 855

• 🔥 https://openwall.com/lists/oss-security/2021/09/01/4 · Exploit
• https://github.com/torvalds/linux/commit/2287a51ba822384834dafc1c798453375d1107c7 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2021:3876-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-40490 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:3205-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2022-9088.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-3702 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2024:3138 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3753 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3753 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:3206-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:14905-1 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2785-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:3179-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:3207-1 · Vendor Advisory