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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
21a091b970cdbcf3e8ff829234b51be6f9192766 to < 6b63308c28987c6010b1180c72a6db4df6c68033affected21a091b970cdbcf3e8ff829234b51be6f9192766 to < 8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10affected21a091b970cdbcf3e8ff829234b51be6f9192766 to < a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7affected21a091b970cdbcf3e8ff829234b51be6f9192766 to < c9a40292a44e78f71258b8522655bffaf5753bdbaffected
Linux Linux
Default version status: affected
6.1affected0 to < 6.1unaffected6.1.125 to ≤ 6.1.*unaffected6.6.72 to ≤ 6.6.*unaffected6.12.10 to ≤ 6.12.*unaffected6.13 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033 ↗
- https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 ↗
- https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 ↗
- https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb ↗
- https://project-zero.issues.chromium.org/issues/388499293 ↗
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗