4.7

CVE-2025-21655

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.1 < 6.1.125
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.72
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.10
Linux ≫ Linux Kernel Version6.13 Updaterc1
Linux ≫ Linux Kernel Version6.13 Updaterc2
Linux ≫ Linux Kernel Version6.13 Updaterc3
Linux ≫ Linux Kernel Version6.13 Updaterc4
Linux ≫ Linux Kernel Version6.13 Updaterc5
Linux ≫ Linux Kernel Version6.13 Updaterc6
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.122
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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
Third Party Advisory
Issue Tracking
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html