Linux Kernel up to 6.12.110/6.18.52 mailbox devm_pm_runtime_enable race condition

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00-

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.12.110/6.18.52. Affected by this vulnerability is the function devm_pm_runtime_enable of the component mailbox. Performing a manipulation results in race condition. This vulnerability is reported as CVE-2026-98904. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.12.110/6.18.52. This affects the function devm_pm_runtime_enable of the component mailbox. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mailbox: imx: Use devm_pm_runtime_enable() sashiko complained about early usage of the device while probe isn't completed. This can be mitigated by delaying the pm_runtime_enable() into the removal path instead doing it early. This ensures that in an error case the device is removed (and imx_mu_shutdown()) before pm_runtime_disable() so we don't have to do this manually. For the order to work, lets move devm_mbox_controller_register() until after the pm-runtime part. So the reverse order will be mbox-controller removal followed by disabling pm runtime. Use devm_pm_runtime_enable(), remove manual pm_runtime_disable() invocations and move the pm_runtime handling in probe before devm_mbox_controller_register().

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98904 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. 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 10/23/2026).

Upgrading to version 6.12.111 or 6.18.53 eliminates this vulnerability. Applying the patch b30a047744ea4344bb6f854b0a052cf276349128/adcaa21d50c3a4c884f4d0b7a95fa3bd7a07cf84/1f602619e408b6e9655ee76656a2a5ab6e89c5e4 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-108860). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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 6.12.111/6.18.53
Patch: b30a047744ea4344bb6f854b0a052cf276349128/adcaa21d50c3a4c884f4d0b7a95fa3bd7a07cf84/1f602619e408b6e9655ee76656a2a5ab6e89c5e4

Timelineinfo

09/25/2026 CVE reserved
10/23/2026 +28 days Advisory disclosed
10/23/2026 +0 days VulDB entry created
10/23/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98904 (🔒)
GCVE (CVE): GCVE-0-2026-98904
GCVE (VulDB): GCVE-100-425667
EUVD: 🔒

Entryinfo

Created: 10/23/2026 14:23
Updated: 10/23/2026 15:59
Changes: 10/23/2026 14:23 (59), 10/23/2026 15:59 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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