PT-2026-39019 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43358

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 missing RCU (Read-Copy-Update) unlock in the error path of the try release subpage extent buffer() function within the btrfs module can occur. This happens because a rcu read unlock() call exists past the loop, but rcu read lock() is not called before exiting the loop in certain error conditions. RCU is a synchronization mechanism that allows multiple readers to access data simultaneously without locking.

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

Related Identifiers

CVE-2026-43358

Affected Products

Linux Kernel

References · 13

• https://nvd.nist.gov/vuln/detail/CVE-2026-43358 · Security Note
• https://ubuntu.com/security/CVE-2026-43358 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43358 · Vendor Advisory
• https://git.kernel.org/stable/c/35b0c8768e848e1b7e32052db36b5fa59b6a33a1 · Patch
• https://cve.org/CVERecord?id=CVE-2026-43358 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43358 · Vendor Advisory
• https://git.kernel.org/stable/c/b2840e33127ce0eea880504b7f133e780f567a9b · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43358 · Vendor Advisory
• https://git.kernel.org/stable/c/5e1ab71f74a1e61f1254dff128a764fdebaec0b8 · Patch
• https://t.me/cveNotify/163639 · Telegram Post
• https://git.kernel.org/linus/b2840e33127ce0eea880504b7f133e780f567a9b · Note
• https://twitter.com/CVEnew/status/2052811013267878273 · Twitter Post
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post