CVE-2026-23386None▾ Sunlit

gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL

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. …

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Mar 25, 2026

Updated

Nov 5, 2026

CVSS

—

Vendor

Linux

Product

Linux

CWE

—

Depth score

3 · Minimal

EPSS

0.12% · p2

Platforms

—

Source

CVEORG

Vector

—

CISA SSVC

decided 2026-11-05

Exploitation: none
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Nov 5.

0.1% → 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 225 days

Mar 25, 2026Published
Disclosed via CVEORG
Nov 5, 2026Record revised
Last analysed / modified upstream
Nov 5, 2026EPSS first tracked
0.1%

Linux #cve.org

Affected

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

Full technical detail▾

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:

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.
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.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org

gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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:

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.

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).

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