What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17

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.

Affected products

• Linux kernel: from 6.16.4 before 6.17; from 6.17.1 before 6.18.19; from 6.19 before 6.19.9; 6.17, 6.17-rc2, 6.17-rc3, 6.17-rc4, 6.17-rc5, 6.17-rc6 (+4) — fixed in 6.17, 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 6.17, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35b0c8768e848e1b7e32052db36b5fa59b6a33a1
• https://git.kernel.org/stable/c/5e1ab71f74a1e61f1254dff128a764fdebaec0b8
• https://git.kernel.org/stable/c/b2840e33127ce0eea880504b7f133e780f567a9b

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