CVE-2026-23386 (GCVE-0-2026-23386)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:28 – Updated: 2026-11-05 21:33
VLAI
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. 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
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 21:29 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 , < 71511dae56a75ce161aa746741e5c498feaea393 (git)
Affected: a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 , < c171f90f58974c784db25e0606051541cb71b7f0 (git)
Affected: a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 , < 07e0c80e17ef781799e7cd5c41a7bf44f1bf6a5f (git)
Affected: a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 , < 3744ebd8ffaa542ae8110fb449adcac0202f4cc8 (git)
Affected: a6fb8d5a8b6925f1e635818d3dd2d89531d4a058 , < fb868db5f4bccd7a78219313ab2917429f715cea (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ngve: corrige la limpieza incorrecta del b\u00fafer 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 b\u00fafer 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 (uni\u00f3n).\n Interpretar los IDs de b\u00fafer 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 tama\u00f1o del array dma, causando advertencias de acceso fuera de l\u00edmites (el rastro a continuaci\u00f3n es c\u00f3mo notamos este problema).\n\nUBSAN: \u00edndice de array fuera de l\u00edmites en\ndrivers/net/ethernet/drivers/net/ethernet/google/gve/gve_tx_dqo.c:178:5 el \u00edndice 18 est\u00e1 fuera de\nrango para el tipo \u0027dma_addr_t[18]\u0027 (tambi\u00e9n conocido como \u0027unsigned long long[18]\u0027)\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 b\u00faferes."
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        "id": "CVE-2026-23386",
        "lastModified": "2026-11-05T22:18:22.377",
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                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
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                "role": "CISA Coordinator",
                "timestamp": "2026-11-05T21:29:29.053573Z",
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        "published": "2026-03-25T11:16:38.960",
        "references": [
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              }
            ],
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      "product_status:known_affected": "156",
      "product_status:known_not_affected": "44",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gve: fix incorrect buffer cleanup in gve_tx_clean_pending_packets for QPL",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23386.json",
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              "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 \u0027dma_addr_t[18]\u0027 (aka \u0027unsigned long long[18]\u0027)\nWorkqueue: gve gve_service_task [gve]\nCall Trace:\n\u003cTASK\u003e\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."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-23386",
        "datePublished": "2026-03-25T10:28:04.118Z",
        "dateReserved": "2026-01-13T15:37:46.008Z",
        "dateUpdated": "2026-11-05T21:33:44.869Z",
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  }
}



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