PT-2020-2226 · Linux+6 · Linux Kernel+6

Wang Wang · Published 2020-03-21 · Updated 2021-05-28 · CVE-2020-12657

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.6.5

Description The issue is related to a use-after-free in the block/bfq-iosched.c file, specifically with the bfq idle slice timer body function. This could allow an attacker to impact the confidentiality, integrity, and availability of protected information.

Recommendations For Linux kernel versions prior to 5.6.5, update to version 5.6.5 or later to resolve the issue. As a temporary workaround, consider restricting access to the bfq idle slice timer body function until a patch is available.

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2020-1913

ALT-PU-2020-1917

ALT-PU-2020-1928

ALT-PU-2020-1929

ALT-PU-2020-2153

ALT-PU-2020-2164

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:2020-02142

CESA-2020_2427

CESA-2020_2428

CESA-2020_2567

CVE-2020-12657

OPENSUSE-SU-2020:0801-1

OPENSUSE-SU-2020_0801-1

RHSA-2020:2427

RHSA-2020:2428

RHSA-2020:2429

RHSA-2020:2567

RHSA-2020:2667

RHSA-2020:2669

RHSA-2020_2427

RHSA-2020_2428

SUSE-SU-2020:1587-1

SUSE-SU-2020:1599-1

SUSE-SU-2020:1602-1

SUSE-SU-2020:1603-1

SUSE-SU-2020:1604-1

SUSE-SU-2020:1605-1

SUSE-SU-2020:1663-1

SUSE-SU-2020:2156-1

SUSE-SU-2020:2478-1

SUSE-SU-2020:2487-1

SUSE-SU-2020_1587-1

SUSE-SU-2020_1599-1

SUSE-SU-2020_1602-1

SUSE-SU-2020_1603-1

SUSE-SU-2020_1604-1

SUSE-SU-2020_1605-1

SUSE-SU-2020_1663-1

USN-4363-1

USN-4367-1

USN-4367-2

USN-4368-1

USN-4369-1

Affected Products

Alt Linux

Centos

Linuxmint

Linux Kernel

Red Hat

Suse

Ubuntu

References · 542

• https://github.com/torvalds/linux/commit/2f95fa5c955d0a9987ffdc3a095e2f4e62c5f2a9 · Patch
• https://ubuntu.com/security/notices/USN-4368-1 · Vendor Advisory
• https://usn.ubuntu.com/4367-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-11668 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:1605-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2020-5714.html · Vendor Advisory
• https://osv.dev/vulnerability/USN-4368-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-12657 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2020:1663-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-11494 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2020-5755.html · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:2156-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2020:2478-1 · Vendor Advisory
• https://usn.ubuntu.com/4363-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4363-1 · Vendor Advisory