{"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:\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. …","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","slug":"CVE-2026-23386","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 71511dae56a75ce161aa746741e5c498feaea393`\n- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < c171f90f58974c784db25e0606051541cb71b7f0`\n- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 07e0c80e17ef781799e7cd5c41a7bf44f1bf6a5f`\n- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < 3744ebd8ffaa542ae8110fb449adcac0202f4cc8`\n- `Linux >= a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 < fb868db5f4bccd7a78219313ab2917429f715cea`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}