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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-20 · updated 2026-10-15

Description

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.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.6 before 5.10.216; from 5.11 before 5.15.156; from 5.16 before 6.1.87; from 6.2 before 6.6.28; from 6.7 before 6.8.7; 6.9-rc1, 6.9-rc2, 6.9-rc3 — fixed in 5.10.216, 5.15.156, 6.1.87, 6.6.28, 6.8.7

How to fix

Upgrade to a fixed version: Linux kernel 5.10.216, 5.15.156, 6.1.87, 6.6.28. Check the vendor advisory for mitigations.

References

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