Linux Kernel up to 6.19.5 mailbox fw_mbox_index_xlate out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.166/6.6.129/6.12.76/6.18.15/6.19.5. This vulnerability affects the function fw_mbox_index_xlate of the component mailbox. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-43281. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.1.166/6.6.129/6.12.76/6.18.15/6.19.5. This affects the function fw_mbox_index_xlate of the component mailbox. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate() Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43281 since 05/01/2026. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 326222 (EulerOS 2.0 SP12 : kernel (EulerOS-SA-2026-2535)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.167, 6.6.130, 6.12.77, 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch 2662ed331a69c0b551f78af58f12eb629a89a36f/31c4c67dec3362094a6747a171a4848e98542265/01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d/4caae8168d1b808c7d4ff481295292e3f97f90fb/f50b39fd7c72a8734153644ee945ca0d8b2e65ab/fcd7f96c783626c07ee3ed75fa3739a8a2052310 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 (326222). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
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: 326222
Nessus Name: EulerOS 2.0 SP12 : kernel (EulerOS-SA-2026-2535)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.167/6.6.130/6.12.77/6.18.16/6.19.6
Patch: 2662ed331a69c0b551f78af58f12eb629a89a36f/31c4c67dec3362094a6747a171a4848e98542265/01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d/4caae8168d1b808c7d4ff481295292e3f97f90fb/f50b39fd7c72a8734153644ee945ca0d8b2e65ab/fcd7f96c783626c07ee3ed75fa3739a8a2052310

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
07/10/2026 +65 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43281 (🔒)
GCVE (CVE): GCVE-0-2026-43281
GCVE (VulDB): GCVE-100-361551

Entryinfo

Created: 05/06/2026 17:21
Updated: 07/10/2026 14:43
Changes: 05/06/2026 17:21 (59), 06/04/2026 14:17 (12), 07/10/2026 14:43 (2)
Complete: 🔍
Cache ID: 216::103

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

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