CVE-2024-43869

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-43869
In the Linux kernel, the following vulnerability has been resolved: perf: Fix event leak upon exec and file release The perf pending task work is never waited upon the matching event release. In the case of a child event, released via free_event() directly, this can potentially result in a leaked event, such as in the following scenario that doesn't even require a weak IRQ work implementation to trigger: schedule() prepare_task_switch() =======> <NMI> perf_event_overflow() event->pending_sigtrap = ... irq_work_queue(&event->pending_irq) <======= </NMI> perf_event_task_sched_out() event_sched_out() event->pending_sigtrap = 0; atomic_long_inc_not_zero(&event->refcount) task_work_add(&event->pending_task) finish_lock_switch() =======> <IRQ> perf_pending_irq() //do nothing, rely on pending task work <======= </IRQ> begin_new_exec() perf_event_exit_task() perf_event_exit_event() // If is child event free_event() WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1) // event is leaked Similar scenarios can also happen with perf_event_remove_on_exec() or simply against concurrent perf_event_release(). Fix this with synchonizing against the possibly remaining pending task work while freeing the event, just like is done with remaining pending IRQ work. This means that the pending task callback neither need nor should hold a reference to the event, preventing it from ever beeing freed.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

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/104e258a004037bc7dba9f6085c71dad6af57ad4 Patch
https://git.kernel.org/stable/c/3a5465418f5fd970e86a86c7f4075be262682840 Patch
https://git.kernel.org/stable/c/9ad46f1fef421d43cdab3a7d1744b2f43b54dae0 Patch
https://git.kernel.org/stable/c/ed2c202dac55423a52d7e2290f2888bf08b8ee99 Patch
https://git.kernel.org/stable/c/f34d8307a73a18de5320fcc6f40403146d061891 Patch
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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*
History

26 Sep 2025, 18:36

Type Values Removed Values Added
CWE CWE-401
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: perf: corrige la fuga de eventos al liberar el archivo y el ejecutable. El trabajo de la tarea pendiente de rendimiento nunca se espera hasta que se libere el evento correspondiente. En el caso de un evento secundario, publicado directamente a través de free_event(), esto puede potencialmente resultar en un evento filtrado, como en el siguiente escenario que ni siquiera requiere una implementación de trabajo IRQ débil para activarse: Schedule() prepare_task_switch() =======&gt; perf_event_overflow() evento-&gt;pending_sigtrap = ... irq_work_queue(&amp;event-&gt;pending_irq) &lt;======= perf_event_task_sched_out() event_sched_out() evento-&gt; pendiente_sigtrap = 0; atomic_long_inc_not_zero(&amp;event-&gt;refcount) task_work_add(&amp;event-&gt;pending_task) Finish_lock_switch() =======&gt; perf_pending_irq() //no hacer nada, confiar en el trabajo de la tarea pendiente &lt;======= &lt; /IRQ&gt; comenzar_new_exec() perf_event_exit_task() perf_event_exit_event() // Si es un evento secundario free_event() WARN(atomic_long_cmpxchg(&amp;event-&gt;refcount, 1, 0) != 1) // el evento se filtró También pueden ocurrir escenarios similares con perf_event_remove_on_exec () o simplemente contra perf_event_release() concurrente. Solucione este problema sincronizando con el trabajo de tarea pendiente posiblemente restante mientras se libera el evento, tal como se hace con el trabajo de IRQ pendiente restante. Esto significa que la devolución de llamada de la tarea pendiente no necesita ni debe contener una referencia al evento, lo que impide que se libere.
CPE cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:-:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/104e258a004037bc7dba9f6085c71dad6af57ad4 - () https://git.kernel.org/stable/c/104e258a004037bc7dba9f6085c71dad6af57ad4 - Patch
References () https://git.kernel.org/stable/c/3a5465418f5fd970e86a86c7f4075be262682840 - () https://git.kernel.org/stable/c/3a5465418f5fd970e86a86c7f4075be262682840 - Patch
References () https://git.kernel.org/stable/c/9ad46f1fef421d43cdab3a7d1744b2f43b54dae0 - () https://git.kernel.org/stable/c/9ad46f1fef421d43cdab3a7d1744b2f43b54dae0 - Patch
References () https://git.kernel.org/stable/c/ed2c202dac55423a52d7e2290f2888bf08b8ee99 - () https://git.kernel.org/stable/c/ed2c202dac55423a52d7e2290f2888bf08b8ee99 - Patch
References () https://git.kernel.org/stable/c/f34d8307a73a18de5320fcc6f40403146d061891 - () https://git.kernel.org/stable/c/f34d8307a73a18de5320fcc6f40403146d061891 - Patch

21 Aug 2024, 01:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-08-21 01:15

Updated : 2025-09-26 18:36

NVD link : CVE-2024-43869

Mitre link : CVE-2024-43869

CVE.ORG link : CVE-2024-43869

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime