Linux Kernel up to 6.19-rc4 devlink_alloc null pointer dereference

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5.5$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.19-rc4. This issue affects the function devlink_alloc. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2026-23019. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.19-rc4. This affects the function devlink_alloc. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. 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: marvell: prestera: fix NULL dereference on devlink_alloc() failure devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer. This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23019 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 297479 (Linux Distros Unpatched Vulnerability : CVE-2026-23019), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 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 8a4333b2818f0d853b43e139936c20659366e4a0/325aea74be7e192b5c947c782da23b0d19a5fda2/94e070cd50790317fba7787ae6006934b7edcb6f/3950054c9512add0cc79ab7e72b6d2f9f675e25b/326a4b7e61d01db3507f71c8bb5e85362f607064/a428e0da1248c353557970848994f35fd3f005e2 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 (297479), EUVD (EUVD-2026-5075) and CERT Bund (WID-SEC-2026-0280). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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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: Null pointer dereference
CWE: CWE-476 / 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: 297479
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23019

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.198/6.1.161/6.6.121/6.12.66/6.18.6/6.19-rc5
Patch: 8a4333b2818f0d853b43e139936c20659366e4a0/325aea74be7e192b5c947c782da23b0d19a5fda2/94e070cd50790317fba7787ae6006934b7edcb6f/3950054c9512add0cc79ab7e72b6d2f9f675e25b/326a4b7e61d01db3507f71c8bb5e85362f607064/a428e0da1248c353557970848994f35fd3f005e2

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-2026-23019 (🔒)
GCVE (CVE): GCVE-0-2026-23019
GCVE (VulDB): GCVE-100-343611
EUVD: 🔒
CERT Bund: WID-SEC-2026-0280 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 01/31/2026 15:22
Updated: 03/25/2026 18:03
Changes: 01/31/2026 15:22 (58), 02/01/2026 03:33 (1), 02/01/2026 07:36 (2), 02/02/2026 18:12 (7), 03/25/2026 18:03 (11)
Complete: 🔍
Cache ID: 216::103

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