CVE-2026-45981

Summary

In the Linux kernel, the following vulnerability has been resolved:

s390/cio: Fix device lifecycle handling in css_alloc_subchannel()

css_alloc_subchannel() calls device_initialize() before setting up the DMA masks. If dma_set_coherent_mask() or dma_set_mask() fails, the error path frees the subchannel structure directly, bypassing the device model reference counting.

Once device_initialize() has been called, the embedded struct device must be released via put_device(), allowing the release callback to free the container structure.

Fix the error path by dropping the initial device reference with put_device() instead of calling kfree() directly.

This ensures correct device lifetime handling and avoids potential use-after-free or double-free issues.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42
• https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424
• https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55
• https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603
• https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7

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