Vulnerability Details CVE-2026-45981
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 7.3%
CVSS Severity
References
- https://git.kernel.org/stable/c/6715560527e343a387e4a0d2e6c401748e89fa55
- https://git.kernel.org/stable/c/abb6e07f46a740cda4f07d1b561ae4eaa7a1df42
- https://git.kernel.org/stable/c/c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603
- https://git.kernel.org/stable/c/f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7
- https://git.kernel.org/stable/c/f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424