---
id: CVE-2026-23386
title: 'gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL'
summary: |-
  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. …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 <
    71511dae56a75ce161aa746741e5c498feaea393
  - >-
    Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 <
    c171f90f58974c784db25e0606051541cb71b7f0
  - >-
    Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 <
    07e0c80e17ef781799e7cd5c41a7bf44f1bf6a5f
  - >-
    Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 <
    3744ebd8ffaa542ae8110fb449adcac0202f4cc8
  - >-
    Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 <
    fb868db5f4bccd7a78219313ab2917429f715cea
  - Linux 6.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T21:29:29.053573Z'
published: '2026-03-25'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:33:44.869Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23386'
references:
  - url: 'https://git.kernel.org/stable/c/71511dae56a75ce161aa746741e5c498feaea393'
  - url: 'https://git.kernel.org/stable/c/c171f90f58974c784db25e0606051541cb71b7f0'
  - url: 'https://git.kernel.org/stable/c/07e0c80e17ef781799e7cd5c41a7bf44f1bf6a5f'
  - url: 'https://git.kernel.org/stable/c/3744ebd8ffaa542ae8110fb449adcac0202f4cc8'
  - url: 'https://git.kernel.org/stable/c/fb868db5f4bccd7a78219313ab2917429f715cea'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02105
ingestedAt: '2026-11-05T22:38:32.128Z'
---

## Overview

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_tx_stop_ring_dqo+0x182/0x200 [gve]
gve_close+0x1be/0x450 [gve]
gve_reset+0x99/0x120 [gve]
gve_service_task+0x61/0x100 [gve]
process_scheduled_works+0x1e9/0x380

Fix this by properly checking for QPL mode and delegating to
gve_free_tx_qpl_bufs() to reclaim the buffers.

## Affected

- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 71511dae56a75ce161aa746741e5c498feaea393`
- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < c171f90f58974c784db25e0606051541cb71b7f0`
- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 07e0c80e17ef781799e7cd5c41a7bf44f1bf6a5f`
- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 3744ebd8ffaa542ae8110fb449adcac0202f4cc8`
- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < fb868db5f4bccd7a78219313ab2917429f715cea`
- `Linux 6.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.