FKIE_CVE-2026-98189

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext() wilc_wlan_handle_isr_ext() takes the RX transfer size from the device-reported interrupt status register (a 15-bit field shifted left by 2, up to 131068 bytes) and reads that many bytes from the device into rx_buffer, which is only WILC_RX_BUFF_SIZE (96K) large. The wrap check only handles the current offset; the size itself is never compared against the buffer, so a bogus SDIO device can make the driver OOB-write rx_buffer by up to ~32K with data it controls. The oversized transfer also leaves rx_buffer_offset past the end of the buffer, after which the unsigned wrap check stops working and the overflow can repeat. Drop any transfer whose size exceeds the RX buffer, acknowledging the data interrupt and re-arming the RX engine so the bogus frame is discarded and reception can continue. This also restores the rx_buffer_offset <= WILC_RX_BUFF_SIZE invariant the wrap check relies on. This is not expected to change driver behavior in most cases: without this check, an oversized transfer would most likely corrupt neighboring kernel memory instead of completing anyway, and the drop path performs the same interrupt acknowledgment and RX engine re-arming as the normal path, so subsequent transfers are received unaffected. Discovered by Atuin - Automated Vulnerability Discovery Engine.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14dcf4c3d74c878175b19d3da5986f83f26b1dd5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/304a5d72a04a3979a6434088c8d9c5172c2a908e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f86fb6f9dce04f697da85806ad96a932fc2f079
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/612ed9224eae70c53c0c88cb0990e0f9b709280a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f6a276ade936a8803f9f3df217c2368944dc321
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aeb44a456d126d89863230eef0187e77e6441995
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1ba7f7f18465e259cf1b4d9c73fc73853d7f790
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/microchip/wilc1000/wlan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "9f6a276ade936a8803f9f3df217c2368944dc321",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "aeb44a456d126d89863230eef0187e77e6441995",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "612ed9224eae70c53c0c88cb0990e0f9b709280a",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "304a5d72a04a3979a6434088c8d9c5172c2a908e",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "4f86fb6f9dce04f697da85806ad96a932fc2f079",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "14dcf4c3d74c878175b19d3da5986f83f26b1dd5",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            },
            {
              "lessThan": "c1ba7f7f18465e259cf1b4d9c73fc73853d7f790",
              "status": "affected",
              "version": "c5c77ba18ea66aa05441c71e38473efb787705a4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/microchip/wilc1000/wlan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "lessThan": "4.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: wilc1000: fix RX buffer OOB-write in wilc_wlan_handle_isr_ext()\n\nwilc_wlan_handle_isr_ext() takes the RX transfer size from the\ndevice-reported interrupt status register (a 15-bit field shifted left by 2,\nup to 131068 bytes) and reads that many bytes from the device into\nrx_buffer, which is only WILC_RX_BUFF_SIZE (96K) large. The wrap\ncheck only handles the current offset; the size itself is never\ncompared against the buffer, so a bogus SDIO device can make the driver\nOOB-write rx_buffer by up to ~32K with data it controls.\n\nThe oversized transfer also leaves rx_buffer_offset past the end of\nthe buffer, after which the unsigned wrap check stops working and\nthe overflow can repeat.\n\nDrop any transfer whose size exceeds the RX buffer, acknowledging\nthe data interrupt and re-arming the RX engine so the bogus frame is\ndiscarded and reception can continue. This also restores the\nrx_buffer_offset \u003c= WILC_RX_BUFF_SIZE invariant the wrap check\nrelies on.\n\nThis is not expected to change driver behavior in most cases:\nwithout this check, an oversized transfer would most likely\ncorrupt neighboring kernel memory instead of completing anyway, and\nthe drop path performs the same interrupt acknowledgment and RX\nengine re-arming as the normal path, so subsequent transfers are\nreceived unaffected.\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine."
    }
  ],
  "id": "CVE-2026-98189",
  "lastModified": "2026-10-06T09:18:04.033",
  "metrics": {},
  "published": "2026-10-06T09:18:04.033",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/14dcf4c3d74c878175b19d3da5986f83f26b1dd5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/304a5d72a04a3979a6434088c8d9c5172c2a908e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3ddb88e237bc1e59fd37b1cf369f3b6c2dedae26"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4f86fb6f9dce04f697da85806ad96a932fc2f079"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/612ed9224eae70c53c0c88cb0990e0f9b709280a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f6a276ade936a8803f9f3df217c2368944dc321"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aeb44a456d126d89863230eef0187e77e6441995"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1ba7f7f18465e259cf1b4d9c73fc73853d7f790"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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