CVE-2026-98850 (GCVE-0-2026-98850)
Vulnerability from cvelistv5
Published
2026-10-18 15:50
Modified
2026-10-21 12:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/packet: prevent TX_RING byte count overflow tpacket_snd() drains every SEND_REQUEST frame in a TX ring and adds each valid packet length to the signed int len_sum. Userspace can recycle completed frames concurrently, so a single blocking send call is not bounded by the ring size. After enough successful transmissions len_sum wraps into the negative range. In particular, 65536 65535-byte frames followed by a 65007-byte frame produce 0xfffffdef, or -EIOCBQUEUED. sock_sendmsg_nosec() treats that as an impossible return and triggers a BUG. On systems configured to panic on oops, a CAP_NET_RAW holder can panic the host kernel. Stop before the next frame would make the byte count exceed INT_MAX. The positive short count leaves that frame pending for a later send call. A two-thread TPACKET_V2 reproducer triggered the BUG on an arm64 build of Linux 7.3-rc4. With this change, the same reproducer returned the expected positive short count without an oops.
References
Impacted products
Vendor Product Version
Linux Linux Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
Version: 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/packet/af_packet.c"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:57:29.795Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae169d318d5d23bac76ece90a7e2b5cb760ed043"
        },
        {
          "url": "https://git.kernel.org/stable/c/be12b221c0301111eeb023be04add3c6ad7c21fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/69ca64bbb528898916f309552053c32a04a36ebc"
        },
        {
          "url": "https://git.kernel.org/stable/c/9fd63d284e251332f4874ef9023cde472f315f86"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cf81fc9505b148b1b70068303ea6ea4b1212403"
        }
      ],
      "title": "net/packet: prevent TX_RING byte count overflow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98850",
    "datePublished": "2026-10-18T15:50:50.062Z",
    "dateReserved": "2026-09-25T10:25:14.376Z",
    "dateUpdated": "2026-10-21T12:57:29.795Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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