PT-2022-6438 · Linux+2 · Linux Kernel+2

Alon Zahavi · Published 2022-04-01 · Updated 2026-03-14 · CVE-2021-3847

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 (affected versions not specified)

Description The issue is related to an unauthorized access flaw in the Linux kernel OverlayFS subsystem. This flaw can be exploited by a local user to escalate their privileges on the system. The problem arises when a user copies a capable file from a nosuid mount into another mount.

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

Improper Preservation of Permissions

Weakness Enumeration

CWE-281

Related Identifiers

ALT-PU-2022-1647

ALT-PU-2022-1730

ALT-PU-2022-1768

ALT-PU-2022-2155

ALT-PU-2023-1684

ALT-PU-2023-1741

ALT-PU-2023-1814

ALT-PU-2023-4894

AZL-9301

BDU:2023-01298

CVE-2021-3847

ECHO-E420-F8E4-BE6F

Affected Products

Alt Linux

Debian

Linux Kernel

References · 18

• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-12-CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3847 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3847 · Security Note
• https://bdu.fstec.ru/vul/2023-01298 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-3847 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2021-3847 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3847 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-9301 · Vendor Advisory
• https://cve.omp.ru/bb30515 · Note
• https://openwall.com/lists/oss-security/2021/10/20/1 · Note
• https://bugzilla.suse.com/show_bug.cgi?id=1191694 · Note