PT-2026-37069 · Linux · Linux Kernel

Joseph · Published 2026-05-05 · Updated 2026-05-07 · CVE-2026-43066

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 memory leak occurs in the ext4 file system within the ext4 fc replay inode() function. The function calls ext4 get fc inode loc() to obtain the inode location, which creates a reference to iloc.bh that requires release via brelse(). However, certain error paths—specifically failures in ext4 handle dirty metadata(), sync dirty buffer(), ext4 mark inode used(), and ext4 iget()—jump to the exit label without releasing iloc.bh. Additionally, the ext4 fc replay inode() function fails to propagate errors correctly, returning 0 regardless of the outcome.

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-2026-43066

Affected Products

Linux Kernel

References · 18

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43066 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43066 · Vendor Advisory
• https://git.kernel.org/stable/c/5a63033696e60b5d70816f1d119645ac5b0b0a03 · Patch
• https://git.kernel.org/stable/c/f7817ad399d604e8639005d87d148b5ec626ad26 · Patch
• https://git.kernel.org/stable/c/ec0a7500d8eace5b4f305fa0c594dd148f0e8d29 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43066 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43066 · Vendor Advisory
• https://git.kernel.org/stable/c/0892f12cd49fde5d5db68137923db107f894f3a3 · Patch
• https://git.kernel.org/stable/c/19782b4c793b49a6aa4abbb307ddff3610009d21 · Patch
• https://ubuntu.com/security/CVE-2026-43066 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43066 · Security Note
• https://git.kernel.org/stable/c/9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43066 · Security Note
• https://git.kernel.org/stable/c/ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b · Patch
• https://git.kernel.org/stable/c/c426231e3d51916e83b6d1ab7ed8a65e83bca5b4 · Patch