Description

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

ublk: make sure ubq->canceling is set when queue is frozen

Now ublk driver depends on `ubq->canceling` for deciding if the request
can be dispatched via uring_cmd & io_uring_cmd_complete_in_task().

Once ubq->canceling is set, the uring_cmd can be done via ublk_cancel_cmd()
and io_uring_cmd_done().

So set ubq->canceling when queue is frozen, this way makes sure that the
flag can be observed from ublk_queue_rq() reliably, and avoids
use-after-free on uring_cmd.

Classification

CVE ID: CVE-2025-22068

Affected Products

Vendor: Linux

Product: Linux, Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.02% (probability of being exploited)

EPSS Percentile: 4.65% (scored less or equal to compared to others)

EPSS Date: 2025-05-06 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-22068
https://git.kernel.org/stable/c/7e3497d7dacb5aee69dd9be842b778083cae0e75
https://git.kernel.org/stable/c/5491400589e7572c2d2627ed6384302f7672aa1d
https://git.kernel.org/stable/c/9158359015f0eda00e521e35b7bc7ebce176aebf
https://git.kernel.org/stable/c/8741d0737921ec1c03cf59aebf4d01400c2b461a

Timeline