PT-2026-39020 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-06-23 · CVE-2026-43359

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 An issue exists in the btrfs component where the 'set received' ioctl can trigger a transaction abort due to an item overflow when adding the BTRFS UUID KEY RECEIVED SUBVOL. A user who owns a subvolume, regardless of whether they have admin privileges (CAP SYS ADMIN), can cause the filesystem to enter read-only (RO) mode by calling this ioctl with the same received UUID field for numerous subvolumes.

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

Integer Underflow

Weakness Enumeration

CWE-191

Related Identifiers

CVE-2026-43359

SUSE-SU-2026:22048-1

SUSE-SU-2026:22076-1

SUSE-SU-2026:22087-1

SUSE-SU-2026:22108-1

SUSE-SU-2026:22137-1

SUSE-SU-2026:2450-1

SUSE-SU-2026:2482-1

SUSE-SU-2026:2591-1

Affected Products

Linux Kernel

References · 374

• https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43359 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:22048-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43359 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2450-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43359 · Security Note
• https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5 · Patch
• https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174 · Patch
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-43359 · Vendor Advisory
• https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:22087-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2591-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43359 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43359 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:22076-1 · Vendor Advisory