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CVE-2026-43358

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

MEDIUM
5.5
CVSS Score
Published: May 8, 2026 at 02:21 PM UTC
Updated: June 17, 2026 at 10:49 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v ≥ 6.16.46.16.4 ≤ v < 6.176.17 ≤ v < 6.18.196.17 ≤ v < 6.19.96.17 ≤ v < 7.06.17.1 ≤ v < 6.18.196.19 ≤ v < 6.19.910ec363cfefeeb77fda4c1ac20a531f21de452646.16.46.176.17 rc26.17 rc36.17 rc46.17 rc56.17 rc66.17 rc77.0 rc17.0 rc27.0 rc3ad580dfa388fabb52af033e3f8cc5d04be985e54
Vendor states this is fixed in 35b0c8768e848e1b7e32052db36b5fa59b6a33a1 (fixed)
Vendor states this is fixed in 5e1ab71f74a1e61f1254dff128a764fdebaec0b8 (fixed)
Vendor states this is fixed in b2840e33127ce0eea880504b7f133e780f567a9b (fixed)
Vendor states this is fixed in 6.17 (unaffected)
Vendor states this is fixed in 6.18.19 (unaffected)
Vendor states this is fixed in 6.19.9 (unaffected)
Vendor states this is fixed in 7.0 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/5e1ab71f74a1e61f1254dff128a764fdebaec0b8
Patch
Source: cverecord
https://git.kernel.org/stable/c/35b0c8768e848e1b7e32052db36b5fa59b6a33a1
Patch
Source: cverecord
https://git.kernel.org/stable/c/b2840e33127ce0eea880504b7f133e780f567a9b

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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