CVE-2026-98025 (GCVE-0-2026-98025)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow The 0xffff length sentinel detects a router reboot and schedules re-enabling of ethernet mode, but then falls through to the rest of the loop body. The next check is } else if (len > CX82310_MTU) { which is the else of the just-matched if -- it never fires for len == 0xffff. The MTU bound that normally caps the incomplete-packet save path is silently bypassed. With 0xffff > skb->len always true (rx_urb_size is 4096), the incomplete-packet branch saves dev->partial_len = skb->len bytes into dev->partial_data. partial_data is kmalloc(hard_mtu) = kmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len after the 2-byte header pull can be up to 4094. A device that sends a 4096-byte URB starting with [0xff 0xff] therefore copies 4094 device-provided bytes into a buffer allocated for 1516 bytes, exceeding its requested size by 2578 bytes. The next URB then reads dev->partial_len (4094) back from the same 1516-byte buffer and dev->partial_rem (65535 - 4094 = 61441) from the new URB's ~4KB skb, both well past their allocations, and delivers the spliced result as a 64KB "frame" to the network stack. Bail out of rx_fixup after scheduling the re-enable work; the remainder of a reboot-marker URB is not meaningful packet data. This restores the invariant that partial_len < CX82310_MTU + 2 on the save path, since every other route there has already passed the MTU check.
References
Impacted products
Vendor Product Version
Linux Linux Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808
Version: 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb
Version: c1b187a86a176e42f5e48066556980e3232b6cab
Version: 4.19.322   ≤
Version: 5.4.284   ≤
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/usb/cx82310_eth.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow\n\nThe 0xffff length sentinel detects a router reboot and schedules\nre-enabling of ethernet mode, but then falls through to the rest\nof the loop body.  The next check is\n\n\t} else if (len \u003e CX82310_MTU) {\n\nwhich is the else of the just-matched if -- it never fires for\nlen == 0xffff.  The MTU bound that normally caps the\nincomplete-packet save path is silently bypassed.\n\nWith 0xffff \u003e skb-\u003elen always true (rx_urb_size is 4096), the\nincomplete-packet branch saves dev-\u003epartial_len = skb-\u003elen bytes\ninto dev-\u003epartial_data.  partial_data is kmalloc(hard_mtu) =\nkmalloc(CX82310_MTU + 2) = 1516 bytes, but skb-\u003elen after the\n2-byte header pull can be up to 4094.  A device that sends a\n4096-byte URB starting with [0xff 0xff] therefore copies 4094\ndevice-provided bytes into a buffer allocated for 1516 bytes,\nexceeding its requested size by 2578 bytes.\n\nThe next URB then reads dev-\u003epartial_len (4094) back from the same\n1516-byte buffer and dev-\u003epartial_rem (65535 - 4094 = 61441) from\nthe new URB\u0027s ~4KB skb, both well past their allocations, and\ndelivers the spliced result as a 64KB \"frame\" to the network\nstack.\n\nBail out of rx_fixup after scheduling the re-enable work; the\nremainder of a reboot-marker URB is not meaningful packet data.\nThis restores the invariant that partial_len \u003c CX82310_MTU + 2 on\nthe save path, since every other route there has already passed\nthe MTU check."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:30.354Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d0c1ce6ef4cefe568e19afa83f543caa3c3c0873"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dbc89e664b4609ad672b5bdeef60df251294b8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/00520cdd21ea6a9b5dc8d53bbd241620d2059554"
        },
        {
          "url": "https://git.kernel.org/stable/c/59bf9e94bdc49557f07d87164269daff7340f4d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"
        },
        {
          "url": "https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975"
        },
        {
          "url": "https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5"
        }
      ],
      "title": "net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98025",
    "datePublished": "2026-09-25T10:23:43.906Z",
    "dateReserved": "2026-09-25T10:19:56.070Z",
    "dateUpdated": "2026-10-19T09:12:30.354Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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