// For flags

CVE-2024-35958

net: ena: Fix incorrect descriptor free behavior

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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

net: ena: Fix incorrect descriptor free behavior

ENA has two types of TX queues:
- queues which only process TX packets arriving from the network stack
- queues which only process TX packets forwarded to it by XDP_REDIRECT
or XDP_TX instructions

The ena_free_tx_bufs() cycles through all descriptors in a TX queue
and unmaps + frees every descriptor that hasn't been acknowledged yet
by the device (uncompleted TX transactions).
The function assumes that the processed TX queue is necessarily from
the first category listed above and ends up using napi_consume_skb()
for descriptors belonging to an XDP specific queue.

This patch solves a bug in which, in case of a VF reset, the
descriptors aren't freed correctly, leading to crashes.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ena: soluciona el comportamiento incorrecto sin descriptor. ENA tiene dos tipos de colas TX: - colas que solo procesan paquetes TX que llegan desde la pila de red - colas que solo procesan paquetes TX reenviados a mediante instrucciones XDP_REDIRECT o XDP_TX. Ena_free_tx_bufs() recorre todos los descriptores en una cola de TX y desasigna + libera todos los descriptores que aún no han sido reconocidos por el dispositivo (transacciones de TX incompletas). La función supone que la cola TX procesada es necesariamente de la primera categoría enumerada anteriormente y termina usando napi_consume_skb() para los descriptores que pertenecen a una cola XDP específica. Este parche resuelve un error por el cual, en caso de restablecer VF, los descriptores no se liberan correctamente, lo que provoca fallos.

This is a vulnerability in the Linux kernel's Elastic Network Adapter (ENA) driver, which manages network interfaces on certain platforms. The driver utilizes two types of transmit (TX) queues: one for packets from the network stack and another for packets directed by XDP (eXpress Data Path) operations. The function ena_free_tx_bufs() is responsible for unmapping and freeing descriptors of uncompleted TX transactions. However, it incorrectly assumes that all TX queues handle packets from the network stack, leading to improper handling of descriptors in XDP-specific queues. This mismanagement can result in descriptors not being freed correctly, potentially causing system crashes, especially during a Virtual Function (VF) reset. The issue has been resolved by updating the driver to correctly differentiate between the two types of TX queues, ensuring proper descriptor management. Users are advised to update their Linux kernel to a version that includes this fix to maintain system stability.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-17 CVE Reserved
  • 2024-05-20 CVE Published
  • 2024-05-21 EPSS Updated
  • 2024-12-19 CVE 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"
>= 5.6 < 5.10.216
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 5.10.216"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.6 < 5.15.156
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 5.15.156"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.6 < 6.1.87
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.1.87"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.6 < 6.6.28
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.6.28"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.6 < 6.8.7
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.8.7"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.6 < 6.9
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.6 < 6.9"
en
Affected