CVEvulnerability
CVE-2025-21655
4.7 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2025-01-20
- Last modified
- 2026-10-15
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 ([email protected])
- 4.7 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-416
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 configurations
• linux linux kernel (>= 6.1 < 6.1.125)
• linux linux kernel (>= 6.2 < 6.6.72)
• linux linux kernel (>= 6.7 < 6.12.10)
• linux linux kernel 6.13
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033 Patch
- https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 Patch
- https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 Patch
- https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb Patch
- https://project-zero.issues.chromium.org/issues/388499293 Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html lists.debian.org
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html cert-portal.siemens.com
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html cert-portal.siemens.com