Linux Kernel up to 6.18.15/6.19.5 wifi brcmf_sdio_remove null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.18.15/6.19.5. This affects the function brcmf_sdio_remove of the component wifi. The manipulation leads to an unknown weakness. This vulnerability is documented as CVE-2026-43144. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.15/6.19.5 and classified as critical. This issue affects the function brcmf_sdio_remove of the component wifi. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential kernel oops when probe fails When probe of the sdio brcmfmac device fails for some reasons (i.e. missing firmware), the sdiodev->bus is set to error instead of NULL, thus the cleanup later in brcmf_sdio_remove() tries to free resources via invalid bus pointer. This happens because sdiodev->bus is set 2 times: first in brcmf_sdio_probe() and second time in brcmf_sdiod_probe(). Fix this by chaning the brcmf_sdio_probe() function to return the error code and set sdio->bus only there.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-43144 since 05/01/2026. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/18/2026).

Upgrading to version 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch 64ccb0aac41c5055780c2a58bbe2c1b362ceccde/379aac7ee8240848aa35f605b06addb4617c863e/243307a0d1b0d01538e202c00454c28b21d4432e 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 CERT Bund (WID-SEC-2026-1405). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Oracle Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.16/6.19.6
Patch: 64ccb0aac41c5055780c2a58bbe2c1b362ceccde/379aac7ee8240848aa35f605b06addb4617c863e/243307a0d1b0d01538e202c00454c28b21d4432e

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
05/18/2026 +12 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43144 (🔒)
GCVE (CVE): GCVE-0-2026-43144
GCVE (VulDB): GCVE-100-361391
CERT Bund: WID-SEC-2026-1405 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/06/2026 16:30
Updated: 05/18/2026 23:34
Changes: 05/06/2026 16:30 (58), 05/17/2026 14:04 (13), 05/18/2026 23:34 (7)
Complete: 🔍
Cache ID: 216::103

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

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