PT-2026-39054 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43393

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 A chunk map leak occurs in the btrfs map block() function after the btrfs chunk map num copies() function is called. The leak happens when the system returns early with an -EINVAL error, resulting in the failure to free the recently looked-up chunk map.

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

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

CVE-2026-43393

Affected Products

Linux Kernel

References · 16

• https://cve.org/CVERecord?id=CVE-2026-43393 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43393 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43393 · Vendor Advisory
• https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43393 · Security Note
• https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43393 · Vendor Advisory
• https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43393 · Vendor Advisory
• https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43393 · Vendor Advisory
• https://git.kernel.org/linus/f15fb3d41543244d1179f423da4a4832a55bc050 · Note
• https://twitter.com/infoflowcloud/status/2052769601176428950 · Twitter Post
• https://twitter.com/CVEnew/status/2052767689765229053 · Twitter Post
• https://docs.bell-sw.com/security/cves/CVE-2026-43393 · Note