PT-2021-8235 · Linux+5 · Linux Kernel+5

Su Yue · Published 2021-10-26 · Updated 2026-04-29 · CVE-2021-47599

Positive Technologies (AI Summary)

CVSS v3.1

4.7

Medium

Base vector

AV:L/AC:H/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 The issue is related to the btrfs component of the Linux kernel and involves a problem with the btrfs show devname() function. The function searches for devices but finds none, leading to a warning. This occurs because btrfs prepare sprout() moves devices into a seed list, and btrfs show devname() cannot find them. The fix involves updating latest dev according to changes in the device list, ensuring the pointer to the device name in /proc/self/mounts remains valid. The RCU protection is sufficient as the device structure is freed after synchronization.

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

Double Free

Race Condition

Weakness Enumeration

CWE-415

CWE-362

Related Identifiers

BDU:2024-11560

CVE-2021-47599

OPENSUSE-SU-2024_2947-1

SUSE-SU-2024:2892-1

SUSE-SU-2024:2894-1

SUSE-SU-2024:2901-1

SUSE-SU-2024:2939-1

SUSE-SU-2024:2940-1

SUSE-SU-2024:2947-1

USN-8070-1

USN-8070-2

USN-8070-3

USN-8098-1

USN-8098-10

USN-8098-2

USN-8098-3

USN-8098-4

USN-8098-5

USN-8098-6

USN-8098-7

USN-8098-8

USN-8098-9

USN-8107-1

USN-8112-1

USN-8112-2

USN-8112-3

USN-8112-4

USN-8112-5

USN-8201-1

USN-8224-1

Affected Products

Debian

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 1426

• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2021-47599 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8098-4 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8112-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2901-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23405 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8098-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8098-5 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8201-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8098-7 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8098-4 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47599 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8070-2 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8098-7 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40019 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8112-3 · Vendor Advisory