Linux Kernel up to 7.2.5 ARM Fault do_DataAbort/do_PrefetchAbort race condition

Summaryinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 7.2.5. This issue affects the function do_DataAbort/do_PrefetchAbort of the component ARM Fault Handler. Performing a manipulation results in race condition. This vulnerability is cataloged as CVE-2026-90304. The attack must be initiated from a local position. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 7.2.5. This affects the function do_DataAbort/do_PrefetchAbort of the component ARM Fault Handler. 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 integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ARM: 9484/1: enable interrupts when unhandled user faults are triggered PREEMPT_RT requires interrupts to be enabled when sending signals. When do_DataAbort()/do_PrefetchAbort() triggers unhandled user faults, that is `inf->fn()` return a non-zero value, and the interrupts are not enabled within the hook function, force_sig_fault() will be called with interrupts disabled. This can be triggered by user programs executing the bkpt instruction, with kernel config CONFIG_PERF_EVENTS=n. Enable interrupts in do_DataAbort()/do_PrefetchAbort() when unhandled user faults are triggered to fix the issue.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-90304 since 09/11/2026. The exploitability is told to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 8d7cbc6df9632d334b21c4be66ccdde76a08fb13/e79ca91165d4fd18549c536abdb86101e889052f is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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