PT-2020-4971 · Linux+2 · Linux Kernel+2

Jann Horn · Published 2020-03-18 · Updated 2022-10-19 · CVE-2020-29370

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 prior to 5.5.11

Description The issue is related to the kmem cache alloc bulk function in the Linux kernel, specifically in the mm/slub.c file. It is associated with errors in executing multithreaded tasks, known as a race condition. Exploitation of this issue may allow an attacker to cause a denial of service. The slowpath in kmem cache alloc bulk lacks the required TID increment.

Recommendations For Linux kernel versions prior to 5.5.11, update to version 5.5.11 or later to resolve the issue. As a temporary workaround, consider restricting access to the kmem cache alloc bulk function until a patch is available.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

ALT-PU-2020-1539

ALT-PU-2020-1622

ALT-PU-2020-1638

ALT-PU-2020-1646

ALT-PU-2020-1714

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:2020-05548

CVE-2020-29370

OPENSUSE-SU-2021:0060-1

OPENSUSE-SU-2021:0242-1

OPENSUSE-SU-2021_0060-1

OPENSUSE-SU-2021_0242-1

SUSE-SU-2021:0096-1

SUSE-SU-2021:0108-1

SUSE-SU-2021:0117-1

Affected Products

Alt Linux

Linux Kernel

Suse

References · 875

• 🔥 https://bugs.chromium.org/p/project-zero/issues/detail?id=2022 · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2021:0108-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-29370 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-05548 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2021:0096-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0060-1 · Vendor Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.11 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-29370 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-29370 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0242-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-29370 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-29370 · Security Note
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fd4d9c7d0c71866ec0c2825189ebd2ce35bd95b8 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-29370 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2021:0117-1 · Vendor Advisory