PT-2026-39020 · Linux · Linux Kernel

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

Positive Technologies (AI Summary)

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 can trigger this overflow by calling the ioctl with the same received UUID field for numerous subvolumes, causing the filesystem to enter read-only (RO) mode. This process does not require administrative privileges (CAP SYS ADMIN).

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

Related Identifiers

CVE-2026-43359

Affected Products

Linux Kernel

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-43359 · Security Note
• https://git.kernel.org/stable/c/b9914db13ac15aca3b74544c0bb1a2e0dad1f174 · Note
• https://git.kernel.org/stable/c/41fb97353ff58fa4f31904c343fc8e3df2f7517d · Note
• https://twitter.com/CVEnew/status/2052811012240244968 · Twitter Post
• https://git.kernel.org/stable/c/b19c0465e4daad5aa8f60552ea0578cf31a11b1e · Note
• https://git.kernel.org/stable/c/d11aefe654a04fc41996d254748d6a38b6b0a7be · Note
• https://git.kernel.org/stable/c/87f2c46003fce4d739138aab4af1942b1afdadac · Note
• https://git.kernel.org/stable/c/2e57b8cac2ba0d38aac76c1ecdfd8b899e3581a5 · Note