CVE-2025-21655
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jan 20, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
21a091b970cdbcf3e8ff829234b51be6f9192766 < 6b63308c28987c6010b1180c72a6db4df6c68033 21a091b970cdbcf3e8ff829234b51be6f9192766 < 8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 21a091b970cdbcf3e8ff829234b51be6f9192766 < a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 21a091b970cdbcf3e8ff829234b51be6f9192766 < c9a40292a44e78f71258b8522655bffaf5753bdb
Linux / Linux
6.1
References
git.kernel.org: https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033 git.kernel.org: https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 git.kernel.org: https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 git.kernel.org: https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb project-zero.issues.chromium.org: https://project-zero.issues.chromium.org/issues/388499293 lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html