Linux Kernel up to 6.18.18/6.19.8 try_release_subpage_extent_buffer infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.18.18/6.19.8. This impacts the function try_release_subpage_extent_buffer. Performing a manipulation results in infinite loop. This vulnerability is reported as CVE-2026-43358. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.18.18/6.19.8. This affects the function try_release_subpage_extent_buffer. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43358 since 05/01/2026. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 315704 (Linux Distros Unpatched Vulnerability : CVE-2026-43358), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 5e1ab71f74a1e61f1254dff128a764fdebaec0b8/35b0c8768e848e1b7e32052db36b5fa59b6a33a1/b2840e33127ce0eea880504b7f133e780f567a9b is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (315704) and CERT Bund (WID-SEC-2026-1454). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Red Hat OpenShift
  • Microsoft Azure Linux
  • Open Source Linux Kernel
  • Proxmox Virtual Environment

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315704
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-43358

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.19/6.19.9
Patch: 5e1ab71f74a1e61f1254dff128a764fdebaec0b8/35b0c8768e848e1b7e32052db36b5fa59b6a33a1/b2840e33127ce0eea880504b7f133e780f567a9b

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
07/27/2026 +80 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43358 (🔒)
GCVE (CVE): GCVE-0-2026-43358
GCVE (VulDB): GCVE-100-362217
CERT Bund: WID-SEC-2026-1454 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/08/2026 18:26
Updated: 07/27/2026 06:17
Changes: 05/08/2026 18:26 (58), 05/18/2026 07:45 (10), 05/22/2026 05:02 (2), 06/19/2026 05:33 (7), 07/27/2026 06:17 (3)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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