Linux Kernel up to 6.19.5 ocfs2 __counted_by memory leak

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

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.19.5. Affected by this vulnerability is the function __counted_by of the component ocfs2. Such manipulation leads to memory leak. This vulnerability is traded as CVE-2026-43168. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.5. It has been rated as critical. Affected by this issue is the function __counted_by of the component ocfs2. 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. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix reflink preserve cleanup issue commit c06c303832ec ("ocfs2: fix xattr array entry __counted_by error") doesn't handle all cases and the cleanup job for preserved xattr entries still has bug: - the 'last' pointer should be shifted by one unit after cleanup an array entry. - current code logic doesn't cleanup the first entry when xh_count is 1. Note, commit c06c303832ec is also a bug fix for 0fe9b66c65f3.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-43168 since 05/01/2026. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 318589 (Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch c44d86ca949cb1e5566ad14510cc26fa1a17e2d8/8ff329353134280b203cb2bce95311cb8f7cbd8a/bb273b68c1719c2925e05557f7e7099edb066680/b2952dbeac2c3c527cb0519d5ffaeb95b062466a/3bdc3766aafb052aef4baadef455a84c1c0a059d/2f4daccd9d9b8b2952df7878df8c2e8ba6439398/5138c936c2c82c9be8883921854bc6f7e1177d8c 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 vulnerability database at Tenable (318589). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

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

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: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 318589
Nessus Name: Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.252/5.15.202/6.1.165/6.6.128/6.12.75/6.18.16/6.19.6
Patch: c44d86ca949cb1e5566ad14510cc26fa1a17e2d8/8ff329353134280b203cb2bce95311cb8f7cbd8a/bb273b68c1719c2925e05557f7e7099edb066680/b2952dbeac2c3c527cb0519d5ffaeb95b062466a/3bdc3766aafb052aef4baadef455a84c1c0a059d/2f4daccd9d9b8b2952df7878df8c2e8ba6439398/5138c936c2c82c9be8883921854bc6f7e1177d8c

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
06/04/2026 +29 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43168 (🔒)
GCVE (CVE): GCVE-0-2026-43168
GCVE (VulDB): GCVE-100-361394

Entryinfo

Created: 05/06/2026 16:30
Updated: 06/04/2026 16:29
Changes: 05/06/2026 16:30 (59), 06/04/2026 16:29 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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