Linux Kernel up to 6.19-rc4 net update_eth_regs_async 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 marked as critical has been reported in Linux Kernel up to 6.19-rc4. This vulnerability affects the function update_eth_regs_async of the component net. Performing a manipulation results in memory leak. This vulnerability is cataloged as CVE-2026-23021. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19-rc4. It has been classified as critical. This affects the function update_eth_regs_async of the component net. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: usb: pegasus: fix memory leak in update_eth_regs_async() When asynchronously writing to the device registers and if usb_submit_urb() fail, the code fail to release allocated to this point resources.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23021 since 01/13/2026. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 297455 (Linux Distros Unpatched Vulnerability : CVE-2026-23021), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.248, 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6 or 6.19-rc5 eliminates this vulnerability. Applying the patch 5397ea6d21c35a17707e201a60761bdee00bcc4e/a40af9a2904a1ab8ce61866ebe2a894ef30754ba/ac5d92d2826dec51e5d4c6854865bc5817277452/93f18eaa190374e0f2d253e3b1a65cee19a7abe6/471dfb97599eec74e0476046b3ef8e7037f27b34/ce6eef731aba23a988decea1df3b08cf978f7b01/afa27621a28af317523e0836dad430bec551eb54 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 (297455), EUVD (EUVD-2026-5073) and CERT Bund (WID-SEC-2026-0280). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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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: 297455
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23021

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.248/5.15.198/6.1.161/6.6.121/6.12.66/6.18.6/6.19-rc5
Patch: 5397ea6d21c35a17707e201a60761bdee00bcc4e/a40af9a2904a1ab8ce61866ebe2a894ef30754ba/ac5d92d2826dec51e5d4c6854865bc5817277452/93f18eaa190374e0f2d253e3b1a65cee19a7abe6/471dfb97599eec74e0476046b3ef8e7037f27b34/ce6eef731aba23a988decea1df3b08cf978f7b01/afa27621a28af317523e0836dad430bec551eb54

Timelineinfo

01/13/2026 CVE reserved
01/31/2026 +18 days Advisory disclosed
01/31/2026 +0 days VulDB entry created
03/25/2026 +53 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23021 (🔒)
GCVE (CVE): GCVE-0-2026-23021
GCVE (VulDB): GCVE-100-343599
EUVD: 🔒
CERT Bund: WID-SEC-2026-0280 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 01/31/2026 15:13
Updated: 03/25/2026 18:03
Changes: 01/31/2026 15:13 (59), 02/01/2026 03:33 (1), 02/01/2026 08:02 (2), 02/02/2026 18:12 (7), 03/25/2026 18:03 (11)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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