PT-2021-2998 · Linux+8 · Linux Kernel+8

Butt3Rflyh4Ck · Published 2021-01-25 · Updated 2022-04-26 · CVE-2021-3348

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions through 5.10.12

Description The issue is related to a use-after-free in the ndb queue rq function in the Linux kernel, specifically in the drivers/block/nbd.c file. This could be triggered by local attackers with access to the nbd device via an I/O request at a certain point during device setup, potentially allowing them to execute arbitrary code.

Recommendations For Linux kernel versions through 5.10.12, update to a version newer than 5.10.12 to resolve the issue. As a temporary workaround, consider restricting access to the nbd device to minimize the risk of exploitation.

Fix

Use After Free

Race Condition

Weakness Enumeration

CWE-416

CWE-362

Related Identifiers

ALSA-2021:4356

ALT-PU-2021-1208

ALT-PU-2021-1249

ALT-PU-2021-1339

ALT-PU-2021-1417

ALT-PU-2021-1424

ALT-PU-2021-1446

ALT-PU-2021-1621

ALT-PU-2021-1656

ALT-PU-2021-1739

ALT-PU-2021-1862

ALT-PU-2021-1866

ALT-PU-2021-1870

BDU:2021-02591

CESA-2021_4140

CESA-2021_4356

CVE-2021-3348

DLA-2610-1

MGASA-2021-0061

MGASA-2021-0085

OESA-2021-1086

OESA-2021-1087

OPENSUSE-SU-2021:0241-1

OPENSUSE-SU-2021_0241-1

RHSA-2021:4140

RHSA-2021:4356

RHSA-2021_4140

RHSA-2021_4356

SUSE-SU-2021:0347-1

SUSE-SU-2021:0354-1

SUSE-SU-2021:0427-1

SUSE-SU-2021:0433-1

SUSE-SU-2021:0434-1

SUSE-SU-2021:0438-1

SUSE-SU-2021:0532-1

SUSE-SU-2021:0739-1

SUSE-SU-2021:0742-1

SUSE-SU-2021_0739-1

SUSE-SU-2021_0742-1

USN-4884-1

USN-4907-1

USN-4909-1

USN-4910-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Linux Kernel

Red Hat

Suse

Ubuntu

References · 423

• https://nvd.nist.gov/vuln/detail/CVE-2021-3348 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2020-29568 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:0433-1 · Vendor Advisory
• http://openwall.com/lists/oss-security/2021/02/01/1 · Patch
• https://cve.org/CVERecord?id=CVE-2021-3348 · Security Note
• https://ubuntu.com/security/CVE-2018-13095 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0532-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0739-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-20194 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4907-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-36158 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:0427-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-28374 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-3348 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3348 · Vendor Advisory