CVE-2025-21655

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21655
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.

4.7 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
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
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
History

15 Oct 2025, 13:56

Type Values Removed Values Added
CWE CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.7
References () https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033 - () https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033 - Patch
References () https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 - () https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 - Patch
References () https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 - () https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 - Patch
References () https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb - () https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdb - Patch
References () https://project-zero.issues.chromium.org/issues/388499293 - () https://project-zero.issues.chromium.org/issues/388499293 - Issue Tracking, Third Party Advisory
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
First Time Linux
Linux linux Kernel

23 Feb 2025, 08:15

Type Values Removed Values Added
References
  • () https://project-zero.issues.chromium.org/issues/388499293 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring/eventfd: garantizar que io_eventfd_signal() posponga otro período de RCU io_eventfd_do_signal() se invoca desde una devolución de llamada de RCU, pero al eliminar la referencia a io_ev_fd, llama a io_eventfd_free() directamente si El recuento cae a cero. Esto no es correcto, ya que cualquier posible liberación de io_ev_fd debería posponerse otro período de gracia de RCU. Simplemente llame a io_eventfd_put() en lugar de abrir el código dec-and-test y free, lo que lo diferirá correctamente a otro período de gracia de RCU.

20 Jan 2025, 14:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-01-20 14:15

Updated : 2025-10-15 13:56

NVD link : CVE-2025-21655

Mitre link : CVE-2025-21655

CVE.ORG link : CVE-2025-21655

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free