CVE-2024-35958 Affecting kernel-core package, versions <0:4.18.0-372.111.1.el8_6


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELCORE-7440830
  • published11 Jul 2024
  • disclosed20 May 2024

Introduced: 20 May 2024

CVE-2024-35958  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-core to version 0:4.18.0-372.111.1.el8_6 or higher.
This issue was patched in RHSA-2024:4447.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-core package and not the kernel-core package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1