PT-2021-6890 · Linux+3 · Linux Kernel+3

Hao Sun · Published 2021-10-28 · Updated 2025-01-24 · CVE-2021-4148

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

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

Description A issue was found in the Linux kernel's block invalidatepage function in fs/buffer.c in the filesystem. The problem is related to a missing sanity check, which may allow a local attacker with user privilege to cause a denial of service problem. The exploitation of this issue can lead to a disruption in service.

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

Exploit

DoS

Weakness Enumeration

CWE-354

Related Identifiers

ALT-PU-2021-3220

ALT-PU-2021-3232

ALT-PU-2021-3270

ALT-PU-2021-3563

ALT-PU-2021-3573

ALT-PU-2022-1240

ALT-PU-2022-1419

ALT-PU-2022-1421

ALT-PU-2023-1814

ALT-PU-2023-4894

BDU:2022-02442

CVE-2021-4148

OPENSUSE-SU-2024_2189-1

SUSE-SU-2024:2008-1

SUSE-SU-2024:2019-1

SUSE-SU-2024:2189-1

SUSE-SU-2024:2190-1

SUSE-SU-2025:0231-1

Affected Products

Alt Linux

Astra Linux

Linux Kernel

Suse

References · 1304

• 🔥 https://lkml.org/lkml/2021/9/12/323 · Exploit
• 🔥 https://lkml.org/lkml/2021/9/17/1037 · Exploit
• https://bdu.fstec.ru/vul/2022-02442 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-4148 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2019-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-4148 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-4148 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-4148 · Security Note
• https://ubuntu.com/security/CVE-2021-4148 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2189-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-4148 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2190-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:0231-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2008-1 · Vendor Advisory