{
  "cveId": "CVE-2026-98850",
  "url": "https://patchblox.com/security/cve/CVE-2026-98850",
  "summary": "CVE-2026-98850 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-98850, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net/packet: prevent TX_RING byte count overflow",
  "description": "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.",
  "published": "2026-10-18T16:17:39Z",
  "severity": "Moderate",
  "cvss": 4.1,
  "epss": 0.00201,
  "epssPercentile": 0.1011,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98850",
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}