CVE-2026-23386
Full vulnerability record from the local CVENow database.
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_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.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-25 11:16:38.960000
Last modified
2026-11-05 22:18:22.377000
View original CVE JSON
{
"id": "CVE-2026-23386",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-25T11:16:38.960",
"lastModified": "2026-11-05T22:18:22.377",
"vulnStatus": "Analyzed",
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL\n\nIn DQ-QPL mode, gve_tx_clean_pending_packets() incorrectly uses the RDA\nbuffer cleanup path. It iterates num_bufs times and attempts to unmap\nentries in the dma array.\n\nThis leads to two issues:\n1. The dma array shares storage with tx_qpl_buf_ids (union).\n Interpreting buffer IDs as DMA addresses results in attempting to\n unmap incorrect memory locations.\n2. num_bufs in QPL mode (counting 2K chunks) can significantly exceed\n the size of the dma array, causing out-of-bounds access warnings\n(trace below is how we noticed this issue).\n\nUBSAN: array-index-out-of-bounds in\ndrivers/net/ethernet/drivers/net/ethernet/google/gve/gve_tx_dqo.c:178:5 index 18 is out of\nrange for type 'dma_addr_t[18]' (aka 'unsigned long long[18]')\nWorkqueue: gve gve_service_task [gve]\nCall Trace:\n<TASK>\ndump_stack_lvl+0x33/0xa0\n__ubsan_handle_out_of_bounds+0xdc/0x110\ngve_tx_stop_ring_dqo+0x182/0x200 [gve]\ngve_close+0x1be/0x450 [gve]\ngve_reset+0x99/0x120 [gve]\ngve_service_task+0x61/0x100 [gve]\nprocess_scheduled_works+0x1e9/0x380\n\nFix this by properly checking for QPL mode and delegating to\ngve_free_tx_qpl_bufs() to reclaim the buffers."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ngve: corrige la limpieza incorrecta del búfer en gve_tx_clean_pending_packets para QPL\n\nEn el modo DQ-QPL, gve_tx_clean_pending_packets() utiliza incorrectamente la ruta de limpieza del búfer RDA. Itera num_bufs veces e intenta desmapear entradas en el array dma.\n\nEsto conduce a dos problemas:\n1. El array dma comparte almacenamiento con tx_qpl_buf_ids (unión).\n Interpretar los IDs de búfer como direcciones DMA resulta en el intento de desmapear ubicaciones de memoria incorrectas.\n2. num_bufs en modo QPL (contando bloques de 2K) puede exceder significativamente el tamaño del array dma, causando advertencias de acceso fuera de límites (el rastro a continuación es cómo notamos este problema).\n\nUBSAN: índice de array fuera de límites en\ndrivers/net/ethernet/drivers/net/ethernet/google/gve/gve_tx_dqo.c:178:5 el índice 18 está fuera de\nrango para el tipo 'dma_addr_t[18]' (también conocido como 'unsigned long long[18]')\nCola de trabajo: gve gve_service_task [gve]\nRastro de Llamada:\n\ndump_stack_lvl+0x33/0xa0\n__ubsan_handle_out_of_bounds+0xdc/0x110\ngve_tx_stop_ring_dqo+0x182/0x200 [gve]\ngve_close+0x1be/0x450 [gve]\ngve_reset+0x99/0x120 [gve]\ngve_service_task+0x61/0x100 [gve]\nprocess_scheduled_works+0x1e9/0x380\n\nSoluciona esto verificando correctamente el modo QPL y delegando a gve_free_tx_qpl_bufs() para reclamar los búferes."
}
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