CVE-2026-90113 (GCVE-0-2026-90113)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-09-17 16:06
VLAI
Title
netdevsim: update queue NAPI association on queue reset
Summary
In the Linux kernel, the following vulnerability has been resolved: netdevsim: update queue NAPI association on queue reset In netdevsim, receive queues (struct nsim_rq) embed their own struct napi_struct. When queue reset is performed (e.g. via queue_reset debugfs), nsim_queue_start() swaps in a newly allocated struct nsim_rq, and nsim_queue_mem_free() later deletes and frees the old one. However, nsim_queue_start() failed to update the queue-to-NAPI mapping via netif_queue_set_napi(). As a result, dev->_rx[idx].napi continued to point to the old NAPI struct. After the old queue was freed, a subsequent queue dump via Netlink (NETDEV_CMD_QUEUE_GET) triggered a KASAN slab-use-after-free read in nla_put_napi_id() when accessing rxq->napi->napi_id. Fix this by calling netif_queue_set_napi() in nsim_queue_start() to associate the new NAPI with the RX queue, and clear the association with netif_queue_set_napi(..., NULL) in nsim_del_napi() during teardown.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f , < b8f32b0804b4bf0cba0ee0a093e3fd74f11d7166 (git)
Affected: 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f , < db038ac4dca0fa626199e9c297eddd8362be0550 (git)
Affected: 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f , < 07e98a4d5e9c292eae97c9cc5ab0937384e48492 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/net/netdevsim/netdev.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetdevsim: update queue NAPI association on queue reset\n\nIn netdevsim, receive queues (struct nsim_rq) embed their own struct\nnapi_struct. When queue reset is performed (e.g. via queue_reset\ndebugfs), nsim_queue_start() swaps in a newly allocated struct nsim_rq,\nand nsim_queue_mem_free() later deletes and frees the old one.\n\nHowever, nsim_queue_start() failed to update the queue-to-NAPI mapping\nvia netif_queue_set_napi(). As a result, dev-\u003e_rx[idx].napi continued to\npoint to the old NAPI struct. After the old queue was freed, a subsequent\nqueue dump via Netlink (NETDEV_CMD_QUEUE_GET) triggered a KASAN\nslab-use-after-free read in nla_put_napi_id() when accessing\nrxq-\u003enapi-\u003enapi_id.\n\nFix this by calling netif_queue_set_napi() in nsim_queue_start() to\nassociate the new NAPI with the RX queue, and clear the association\nwith netif_queue_set_napi(..., NULL) in nsim_del_napi() during teardown."
        }
      ],
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        "dateUpdated": "2026-09-17T16:06:20.070Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/07e98a4d5e9c292eae97c9cc5ab0937384e48492"
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    "cveId": "CVE-2026-90113",
    "datePublished": "2026-09-17T16:06:20.070Z",
    "dateReserved": "2026-09-11T19:38:34.787Z",
    "dateUpdated": "2026-09-17T16:06:20.070Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetdevsim: update queue NAPI association on queue reset\n\nIn netdevsim, receive queues (struct nsim_rq) embed their own struct\nnapi_struct. When queue reset is performed (e.g. via queue_reset\ndebugfs), nsim_queue_start() swaps in a newly allocated struct nsim_rq,\nand nsim_queue_mem_free() later deletes and frees the old one.\n\nHowever, nsim_queue_start() failed to update the queue-to-NAPI mapping\nvia netif_queue_set_napi(). As a result, dev-\u003e_rx[idx].napi continued to\npoint to the old NAPI struct. After the old queue was freed, a subsequent\nqueue dump via Netlink (NETDEV_CMD_QUEUE_GET) triggered a KASAN\nslab-use-after-free read in nla_put_napi_id() when accessing\nrxq-\u003enapi-\u003enapi_id.\n\nFix this by calling netif_queue_set_napi() in nsim_queue_start() to\nassociate the new NAPI with the RX queue, and clear the association\nwith netif_queue_set_napi(..., NULL) in nsim_del_napi() during teardown."
          }
        ],
        "id": "CVE-2026-90113",
        "lastModified": "2026-09-17T17:17:03.367",
        "metrics": {},
        "published": "2026-09-17T17:17:03.367",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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