{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808"
            },
            {
              "fixed": "3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"
            },
            {
              "fixed": "659654654eb140851467af41d610473c100c7975"
            },
            {
              "fixed": "237c9ae7145772af147e4665f158938350fa5658"
            },
            {
              "fixed": "5d50e90add8b4a978395e893e81954d19d58a7c5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb"
            },
            {
              "last_affected": "c1b187a86a176e42f5e48066556980e3232b6cab"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.19.322"
            },
            {
              "fixed": "4.20"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.284"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.10.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98025.json"
  },
  "details": "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's ~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.",
  "id": "CVE-2026-98025",
  "modified": "2026-09-27T03:31:01.411546050Z",
  "published": "2026-09-25T10:23:43.906Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98025.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98025"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow"
}