{
  "cveId": "CVE-2026-98044",
  "url": "https://patchblox.com/security/cve/CVE-2026-98044",
  "summary": "CVE-2026-98044 is fixed in 30 products on 1 platform, first by DEBIAN-CVE-2026-98044, released October 2, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "bpf: Reject legacy packet loads from callbacks",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Reject legacy packet loads from callbacks  check_ld_abs() models a failed BPF_LD_ABS or BPF_LD_IND in a subprogram as an implicit return with R0 set to zero. It calls prepare_func_exit() to explore this synthesized path.  When the load is reached directly from a synchronous callback, prepare_func_exit() enforces the callback return contract and marks R0 precise. R0 is not derived from a real instruction on this path, so precision backtracking reaches the callback call with R0 still requested and triggers the \u0022callback unexpected regs\u0022 verifier bug. A privileged program loader can therefore cause a verifier warning and an -EFAULT BPF_PROG_LOAD.  These legacy packet-load instructions are deprecated. Reject them from callbacks rather than complicating their implicit-return model. Check all active frames before constructing the implicit return so nested static subprograms cannot hide the callback context.  Global functions are verified independently with a fresh frame zero, so an active-frame check cannot identify a global function called from a callback. Also check the complete subprogram call graph during stack-depth validation and reject a function containing a legacy load when any caller is a callback. This covers global and static descendants without making has_ld_abs transitive, preserving its per-function BTF return-type check. Ordinary uses outside callbacks remain supported.",
  "published": "2026-09-25T11:17:33Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00168,
  "epssPercentile": 0.06068,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98044",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "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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}