PT-2021-6851 · Linux+6 · Linux Kernel+6

Wenqing Liu · Published 2021-12-10 · Updated 2024-03-25 · CVE-2021-44879

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.16.3

Description The issue is related to the gc data segment function in the Linux kernel, specifically in fs/f2fs/gc.c. It involves a NULL pointer dereference due to special files not being considered, which can lead to a denial of service. An attacker could potentially exploit this issue to cause a service disruption.

Recommendations For Linux kernel versions prior to 5.16.3, update to version 5.16.3 or later to resolve the issue. As a temporary workaround, consider restricting access to the gc data segment function in fs/f2fs/gc.c to minimize the risk of exploitation.

Exploit

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2022-1171

ALT-PU-2022-1175

ALT-PU-2022-1647

ALT-PU-2022-2155

ALT-PU-2023-1684

ALT-PU-2023-1741

ALT-PU-2023-1814

ALT-PU-2023-4894

AZL-8577

BDU:2022-02325

CVE-2021-44879

DLA-3710-1

DLA-3711-1

DSA-5594-1

OESA-2022-1574

OPENSUSE-SU-2022:0768-1

OPENSUSE-SU-2022:1037-1

OPENSUSE-SU-2022:1039-1

OPENSUSE-SU-2022_0768-1

OPENSUSE-SU-2022_1037-1

OPENSUSE-SU-2022_1039-1

OPENSUSE-SU-2022_2520-1

OPENSUSE-SU-2022_2615-1

SUSE-SU-2022:0757-1

SUSE-SU-2022:0759-1

SUSE-SU-2022:0761-1

SUSE-SU-2022:0765-1

SUSE-SU-2022:0766-1

SUSE-SU-2022:0767-1

SUSE-SU-2022:0768-1

SUSE-SU-2022:1037-1

SUSE-SU-2022:1038-1

SUSE-SU-2022:1039-1

SUSE-SU-2022:1257-1

SUSE-SU-2022:2520-1

SUSE-SU-2022:2615-1

USN-5302-1

USN-5383-1

USN-6681-1

USN-6681-2

USN-6681-3

USN-6681-4

USN-6716-1

Affected Products

Alt Linux

Astra Linux

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 554

• 🔥 https://bugzilla.kernel.org/show_bug.cgi?id=215231 · Exploit
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-44879 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6681-3 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-0617 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0768-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-0340 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-23004 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-44879 · Security Note
• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0765-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-51782 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-26878 · Vendor Advisory
• https://ubuntu.com/security/CVE-2022-24448 · Vendor Advisory
• https://osv.dev/vulnerability/USN-6681-2 · Vendor Advisory