CVE-2026-45981
published 2026-05-27CVE-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()`…
medium5.5
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
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 | abb6e07f46a740cda4f07d1b561ae4eaa7a1df42 |
| linux | linux | >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 | f96c5ccf95ae5f27218c1ce2d6a3ad2d3e105424 |
| linux | linux | >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < 6715560527e343a387e4a0d2e6c401748e89fa55 | 6715560527e343a387e4a0d2e6c401748e89fa55 |
| linux | linux | >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 | c35cfbb5341ba05ad1b4476ffc3c21cc3ff8f603 |
| linux | linux | >= e5dcf0025d7af58f525590ac86ac27cb44714e8d < f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 | f65c75b0b9b5a390bc3beadcde0a6fbc3ad118f7 |
| linux | linux_kernel | — | — |