Linux Kernel up to 6.19.10 ext4 ext4_fc_replay_inode memory leak

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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.19.10. This affects the function ext4_fc_replay_inode of the component ext4. The manipulation leads to memory leak. This vulnerability is uniquely identified as CVE-2026-43066. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.10. It has been rated as critical. This issue affects the function ext4_fc_replay_inode of the component ext4. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths During code review, Joseph found that ext4_fc_replay_inode() calls ext4_get_fc_inode_loc() to get the inode location, which holds a reference to iloc.bh that must be released via brelse(). However, several error paths jump to the 'out' label without releasing iloc.bh: - ext4_handle_dirty_metadata() failure - sync_dirty_buffer() failure - ext4_mark_inode_used() failure - ext4_iget() failure Fix this by introducing an 'out_brelse' label placed just before the existing 'out' label to ensure iloc.bh is always released. Additionally, make ext4_fc_replay_inode() propagate errors properly instead of always returning 0.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-43066 since 05/01/2026. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 312305 (Linux Distros Unpatched Vulnerability : CVE-2026-43066), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21 or 6.19.11 eliminates this vulnerability. Applying the patch 0892f12cd49fde5d5db68137923db107f894f3a3/5a63033696e60b5d70816f1d119645ac5b0b0a03/9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25/ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b/19782b4c793b49a6aa4abbb307ddff3610009d21/f7817ad399d604e8639005d87d148b5ec626ad26/c426231e3d51916e83b6d1ab7ed8a65e83bca5b4/ec0a7500d8eace5b4f305fa0c594dd148f0e8d29 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 (312305) and CERT Bund (WID-SEC-2026-1385). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Microsoft Azure Linux

Productinfo

Type

Vendor

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

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / 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: 312305
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-43066

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/5.15.203/6.1.168/6.6.131/6.12.80/6.18.21/6.19.11
Patch: 0892f12cd49fde5d5db68137923db107f894f3a3/5a63033696e60b5d70816f1d119645ac5b0b0a03/9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25/ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b/19782b4c793b49a6aa4abbb307ddff3610009d21/f7817ad399d604e8639005d87d148b5ec626ad26/c426231e3d51916e83b6d1ab7ed8a65e83bca5b4/ec0a7500d8eace5b4f305fa0c594dd148f0e8d29

Timelineinfo

05/01/2026 CVE reserved
05/05/2026 +4 days Advisory disclosed
05/05/2026 +0 days VulDB entry created
06/08/2026 +34 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43066 (🔒)
GCVE (CVE): GCVE-0-2026-43066
GCVE (VulDB): GCVE-100-361187
CERT Bund: WID-SEC-2026-1385 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/05/2026 19:00
Updated: 06/08/2026 13:13
Changes: 05/05/2026 19:00 (59), 05/06/2026 12:19 (2), 05/06/2026 22:08 (7), 06/01/2026 04:42 (10), 06/08/2026 13:13 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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