// For flags

CVE-2024-50145

octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

octeon_ep: Add SKB allocation failures handling in __octep_oq_process_rx()

build_skb() returns NULL in case of a memory allocation failure so handle
it inside __octep_oq_process_rx() to avoid NULL pointer dereference.

__octep_oq_process_rx() is called during NAPI polling by the driver. If
skb allocation fails, keep on pulling packets out of the Rx DMA queue: we
shouldn't break the polling immediately and thus falsely indicate to the
octep_napi_poll() that the Rx pressure is going down. As there is no
associated skb in this case, don't process the packets and don't push them
up the network stack - they are skipped.

Helper function is implemented to unmmap/flush all the fragment buffers
used by the dropped packet. 'alloc_failures' counter is incremented to
mark the skb allocation error in driver statistics.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: octeon_ep: Agregar manejo de fallas de asignación de SKB en __octep_oq_process_rx() build_skb() devuelve NULL en caso de una falla de asignación de memoria, por lo que se maneja dentro de __octep_oq_process_rx() para evitar la desreferencia del puntero NULL. __octep_oq_process_rx() es llamado durante el sondeo NAPI por el controlador. Si la asignación de skb falla, sigue extrayendo paquetes de la cola DMA de Rx: no deberíamos interrumpir el sondeo inmediatamente y, por lo tanto, indicar falsamente a octep_napi_poll() que la presión de Rx está disminuyendo. Como no hay un skb asociado en este caso, no procesa los paquetes y no los empuja hacia arriba en la pila de red: se omiten. Se implementa una función auxiliar para desmapear/vaciar todos los buferes de fragmentos utilizados por el paquete descartado. El contador 'alloc_failures' se incrementa para marcar el error de asignación de skb en las estadísticas del controlador. Encontrado por Linux Verification Center (linuxtesting.org) con SVACE.

*Credits: N/A
CVSS Scores
Attack Vector
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Attack Complexity
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Privileges Required
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User Interaction
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Scope
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Confidentiality
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Integrity
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Availability
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* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
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Automatable
-
Tech. Impact
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* Organization's Worst-case Scenario
Timeline
  • 2024-10-21 CVE Reserved
  • 2024-11-07 CVE Published
  • 2024-11-07 CVE Updated
  • ---------- EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.19 < 6.1.115
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.1.115"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.19 < 6.6.59
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.6.59"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.19 < 6.11.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.11.6"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.19 < 6.12-rc5
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.12-rc5"
en
Affected