PT-2026-39022 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43361

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 in the btrfs filesystem allows a user to trigger a transaction abort by repeatedly snapshotting a previously received subvolume. This occurs when a BTRFS UUID KEY RECEIVED SUBVOL item overflow is reached, which is the maximum item size that can be stored in a leaf. Because the snapshot, send, set received subvol, and subvol setflags functions only require inode owner or capable() rather than CAP SYS ADMIN, a malicious user can exploit this to force the filesystem into read-only mode, resulting in system disruption.

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

Related Identifiers

CVE-2026-43361

Affected Products

Linux Kernel

References · 17

• https://git.kernel.org/stable/c/bac55dde8efa457e769c934fd88a63f2141ba238 · Patch
• https://git.kernel.org/stable/c/e3d8efc157bc590457d3e31da403af1a221643d6 · Patch
• https://ubuntu.com/security/CVE-2026-43361 · Vendor Advisory
• https://git.kernel.org/stable/c/6bce705b699cba9afccb996c77d194fe003dfa2a · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43361 · Vendor Advisory
• https://git.kernel.org/stable/c/9a9227b488ffb7cdbb5d930a01fc6956c05ba61a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43361 · Security Note
• https://git.kernel.org/stable/c/e1b18b959025e6b5dbad668f391f65d34b39595a · Patch
• https://git.kernel.org/stable/c/770af8e465c2c3de528f85e840eab462dd41542b · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43361 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43361 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-43361 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2026-43361 · Vendor Advisory
• https://git.kernel.org/linus/e1b18b959025e6b5dbad668f391f65d34b39595a · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43361 · Note