CVE-2026-43180 (GCVE-0-2026-43180)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-08-05 12:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode kaweth_set_rx_mode(), the ndo_set_rx_mode callback, calls netif_stop_queue() and netif_wake_queue(). These are TX queue flow control functions unrelated to RX multicast configuration. The premature netif_wake_queue() can re-enable TX while tx_urb is still in-flight, leading to a double usb_submit_urb() on the same URB: kaweth_start_xmit() { netif_stop_queue(); usb_submit_urb(kaweth->tx_urb); } kaweth_set_rx_mode() { netif_stop_queue(); netif_wake_queue(); // wakes TX queue before URB is done } kaweth_start_xmit() { netif_stop_queue(); usb_submit_urb(kaweth->tx_urb); // URB submitted while active } This triggers the WARN in usb_submit_urb(): "URB submitted while active" This is a similar class of bug fixed in rtl8150 by - commit 958baf5eaee3 ("net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast"). Also kaweth_set_rx_mode() is already functionally broken, the real set_rx_mode action is performed by kaweth_async_set_rx_mode(), which in turn is not a no-op only at ndo_open() time.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/kaweth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/kaweth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
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            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
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              "status": "unaffected",
              "version": "6.19.6",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "6.1.165",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
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                  "vulnerable": true
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode\n\nkaweth_set_rx_mode(), the ndo_set_rx_mode callback, calls\nnetif_stop_queue() and netif_wake_queue(). These are TX queue flow\ncontrol functions unrelated to RX multicast configuration.\n\nThe premature netif_wake_queue() can re-enable TX while tx_urb is still\nin-flight, leading to a double usb_submit_urb() on the same URB:\n\nkaweth_start_xmit() {\n    netif_stop_queue();\n    usb_submit_urb(kaweth-\u003etx_urb);\n}\n\nkaweth_set_rx_mode() {\n    netif_stop_queue();\n    netif_wake_queue();             // wakes TX queue before URB is done\n}\n\nkaweth_start_xmit() {\n    netif_stop_queue();\n    usb_submit_urb(kaweth-\u003etx_urb); // URB submitted while active\n}\n\nThis triggers the WARN in usb_submit_urb():\n\n  \"URB submitted while active\"\n\nThis is a similar class of bug fixed in rtl8150 by\n\n- commit 958baf5eaee3 (\"net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast\").\n\nAlso kaweth_set_rx_mode() is already functionally broken, the\nreal set_rx_mode action is performed by kaweth_async_set_rx_mode(),\nwhich in turn is not a no-op only at ndo_open() time."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable callback is reachable through local socket operations such as IPv4/IPv6 multicast membership changes on a host with a kaweth USB Ethernet interface. Remote network packets alone do not invoke ndo_set_rx_mode.\nAC:L - The attacker can control both sides by generating transmit traffic while repeatedly changing multicast/RX mode state. The active-URB window is repeatable and does not depend on conditions outside attacker control once the affected device is present.\nPR:L - A local unprivileged user can reach the callback through normal multicast socket membership paths without CAP_NET_ADMIN. Admin ioctl/netlink paths also exist, but they are not the least-privileged path.\nUI:N - No victim action is required after the affected interface is present and usable. The attacker can trigger both TX and RX-mode changes from their own local process.\nS:U - The impact remains within the same kernel/host security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The second transmit can refill an active URB and overwrite kaweth-\u003etx_skb; the failed submit frees that skb while completion later uses/frees the same pointer. Treating this kernel heap UAF/double-free as exploitable, high confidentiality impact is defensible.\nI:H - The stale skb and active URB manipulation create kernel memory corruption, not merely a clean error return. With heap shaping, this can plausibly become arbitrary write or control-flow compromise.\nA:H - At minimum the bug triggers the usb_submit_urb active-URB WARN path. The associated UAF/double-free memory corruption can also oops, panic, or hang the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:21.114Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/443a830b1dc4f85c7560da59d4494b629feee215"
        },
        {
          "url": "https://git.kernel.org/stable/c/586318c2730433184c6f1d21183e346ddf25e81d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2cd4b4db315a845a5603d08c9d03b11ddfc799d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef9b10a020503888eb6c8ed85a3d901a624ede4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c79b839a63980c7da7ec5db895198045e154112"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc393af769af845d9985e2845e49553d8f015a64"
        },
        {
          "url": "https://git.kernel.org/stable/c/8367c0e90126426e60581e4c07e1ec4411a0f843"
        },
        {
          "url": "https://git.kernel.org/stable/c/64868f5ecadeb359a49bc4485bfa7c497047f13a"
        }
      ],
      "title": "net: usb: kaweth: remove TX queue manipulation in kaweth_set_rx_mode",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43180",
    "datePublished": "2026-05-06T11:27:52.983Z",
    "dateReserved": "2026-05-01T14:12:55.991Z",
    "dateUpdated": "2026-08-05T12:26:21.114Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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