CVE-2024-35958 net: ena: Fix incorrect descriptor free behavior

2024-05-2009:41:50

Linux

github.com

vulnerability resolved

linux kernel

incorrect descriptor behavior

ena

tx queues

xdp_redirect

xdp_tx instructions

ena_free_tx_bufs()

uncompleted tx transactions

napi_consume_skb()

vf reset

crashes.

AI Score

6.9

Confidence

Low

EPSS

Percentile

10.3%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "548c4940b9f1",
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        "status": "affected",
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        "status": "affected",
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    ],
    "programFiles": [
      "drivers/net/ethernet/amazon/ena/ena_netdev.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
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        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.216",
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        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.156",
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      {
        "status": "unaffected",
        "version": "6.1.87",
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      {
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        "status": "unaffected",
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        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/amazon/ena/ena_netdev.c"
    ],
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  }
]