Riskcovery

CVE-2025-21655

io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period

State
Published
Severity
7.8 High
Published
Jan 20, 2025
Updated
Oct 15, 2026
Reserved
Dec 29, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 21a091b970cdbcf3e8ff829234b51be6f9192766 to before 6b63308c28987c6010b1180c72a6db4df6c68033Affected
  • 21a091b970cdbcf3e8ff829234b51be6f9192766 to before 8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10Affected
  • 21a091b970cdbcf3e8ff829234b51be6f9192766 to before a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7Affected
  • 21a091b970cdbcf3e8ff829234b51be6f9192766 to before c9a40292a44e78f71258b8522655bffaf5753bdbAffected
LinuxLinux
  • 6.1Affected
  • before 6.1Not affected
  • 6.1.125 through 6.1.*Not affected
  • 6.6.72 through 6.6.*Not affected
  • 6.12.10 through 6.12.*Not affected
  • 6.13 and laterNot affected

References

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