CVE-2026-23386

Technical Description

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

gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL

In DQ-QPL mode, gve_tx_clean_pending_packets() incorrectly uses the RDA

buffer cleanup path. It iterates num_bufs times and attempts to unmap

entries in the dma array.

This leads to two issues:

1. The dma array shares storage with tx_qpl_buf_ids (union).

Interpreting buffer IDs as DMA addresses results in attempting to

unmap incorrect memory locations.

2. num_bufs in QPL mode (counting 2K chunks) can significantly exceed

the size of the dma array, causing out-of-bounds access warnings

(trace below is how we noticed this issue).

UBSAN: array-index-out-of-bounds in

drivers/net/ethernet/drivers/net/ethernet/google/gve/gve_tx_dqo.c:178:5 index 18 is out of

range for type 'dma_addr_t[18]' (aka 'unsigned long long[18]')

Workqueue: gve gve_service_task [gve]

Call Trace:

<TASK>

dump_stack_lvl+0x33/0xa0

__ubsan_handle_out_of_bounds+0xdc/0x110

gve_t

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References