Linux Kernel up to 7.2.12 xiic request_threaded_irq race condition

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 7.2.12. Affected by this vulnerability is the function request_threaded_irq of the component xiic. This manipulation causes race condition. This vulnerability appears as CVE-2026-99248. The attack requires local access. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2.12. It has been declared as problematic. Affected by this vulnerability is the function request_threaded_irq of the component xiic. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: i2c: xiic: restore non-managed runtime PM to fix clk WARN flood The devres conversion replaced manual pm_runtime_enable()/disable() with devm_pm_runtime_set_active_enabled() and dropped the remove-time runtime PM teardown. The managed release tears runtime PM down in the wrong order: it calls pm_runtime_dont_use_autosuspend() before pm_runtime_disable(), i.e. while runtime PM is still enabled, and devres is LIFO so the devm_clk_get_enabled() release runs afterwards. At remove(), pm_runtime_put_sync() leaves the device active with the autosuspend timer armed. Clearing use_autosuspend then makes rpm_idle() suspend immediately, and xiic_i2c_runtime_suspend() clk_disable()s the clock. The later devm_clk_get_enabled() release clk_disable_unprepare()s the already-disabled clock, so clk_core_disable() WARNs ("clkN already disabled") on every teardown. Drop the managed helper and restore the non-managed runtime PM setup and teardown, so runtime PM is enabled once in probe and disabled once in remove and the clock enable count stays balanced. Order the remove teardown so runtime PM is disabled before the usage count is dropped: pm_runtime_disable() followed by pm_runtime_put_noidle() instead of pm_runtime_put_sync(). Dropping the count first with autosuspend still enabled arms the autosuspend timer, and a preemption before pm_runtime_disable() lets it expire, suspend the device and clk_disable() the clock, which the devm release then disables again - the same WARN. Restore the non-managed IRQ request as well. The probe error paths now unwind runtime PM by hand via goto, and a devm-registered handler is only freed later during devres unwind, so it would stay live across the manual teardown (and across any future failing step added after it). Request the IRQ with request_threaded_irq() and free it explicitly in the probe error path and in remove. The probe error path also clears use_autosuspend, to match the teardown in remove().

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-99248 since 09/25/2026. The exploitation appears to be easy. Attacking locally is a requirement. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.2.13 eliminates this vulnerability. Applying the patch 47e105bdc863f2b320f9c05c80a63d3b83312700/d33373c565af9c8a28776af02bd20ba6e5724211 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
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.2.10
• 7.2.11
• 7.2.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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