CVE-2025-21655
High
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedJan 20, 2025
First seenJan 20, 2025
How to fix
Update
- linux linux_kernel6.1.125, 6.6.72, 6.12.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.1 ≤ v < 6.1.125, 6.2 ≤ v < 6.6.72, 6.7 ≤ v < 6.12.10, 6.13 | 6.1.125, 6.6.72, 6.12.10 |
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