{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1"
            },
            {
              "fixed": "be12b221c0301111eeb023be04add3c6ad7c21fe"
            },
            {
              "fixed": "69ca64bbb528898916f309552053c32a04a36ebc"
            },
            {
              "fixed": "9fd63d284e251332f4874ef9023cde472f315f86"
            },
            {
              "fixed": "2cf81fc9505b148b1b70068303ea6ea4b1212403"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.31"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.56"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98850.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: prevent TX_RING byte count overflow\n\ntpacket_snd() drains every SEND_REQUEST frame in a TX ring and adds\neach valid packet length to the signed int len_sum. Userspace can\nrecycle completed frames concurrently, so a single blocking send call\nis not bounded by the ring size.\n\nAfter enough successful transmissions len_sum wraps into the negative\nrange. In particular, 65536 65535-byte frames followed by a 65007-byte\nframe produce 0xfffffdef, or -EIOCBQUEUED. sock_sendmsg_nosec() treats\nthat as an impossible return and triggers a BUG. On systems configured\nto panic on oops, a CAP_NET_RAW holder can panic the host kernel.\n\nStop before the next frame would make the byte count exceed INT_MAX.\nThe positive short count leaves that frame pending for a later send\ncall.\n\nA two-thread TPACKET_V2 reproducer triggered the BUG on an arm64 build\nof Linux 7.3-rc4. With this change, the same reproducer returned the\nexpected positive short count without an oops.",
  "id": "CVE-2026-98850",
  "modified": "2026-10-20T02:30:51.442448594Z",
  "published": "2026-10-18T15:50:50.062Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2cf81fc9505b148b1b70068303ea6ea4b1212403"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69ca64bbb528898916f309552053c32a04a36ebc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fd63d284e251332f4874ef9023cde472f315f86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be12b221c0301111eeb023be04add3c6ad7c21fe"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98850.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98850"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/packet: prevent TX_RING byte count overflow"
}