CVE-2026-43358 btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()

What is CVE-2026-43358?

CVE-2026-43358 is a medium-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()

Call rcu_read_lock() before exiting the loop in try_release_subpage_extent_buffer() because there is a rcu_read_unlock() call past the loop.

This has been detected by the Clang thread-safety analyzer.

Which versions are affected by CVE-2026-43358?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43358?

Apply the vendor's patch.

Is CVE-2026-43358 being exploited?

There is no known exploitation of CVE-2026-43358 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-43358, DEBIAN-CVE-2026-43358, GHSA-hgfh-gxxh-hw2v, UBUNTU-CVE-2026-43358.