{
  "cveId": "CVE-2026-98040",
  "url": "https://patchblox.com/security/cve/CVE-2026-98040",
  "summary": "CVE-2026-98040 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98040 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Mark the zero register precise for a regist...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Mark the zero register precise for a register-form NULL check  check_cond_jmp_op() accepts \u0022if rA \u003Cop\u003E rB\u0022 as a NULL check for a nullable pointer rA when rB is a scalar known to be zero, lifts PTR_MAYBE_NULL from rA in the corresponding branch and does not mark rB precise. Consider the following program:    r0 = bpf_get_prandom_u32();   r6 = 1;                  /* the r6 == 0 path is explored first */   if (r0 == 0) goto 1f;   r6 = 0; 1:   r0 = bpf_map_lookup_elem(map, \u00260);  /* absent, NULL at runtime */   if (r0 == r6) goto 2f;   /* taken as a NULL check for r0       */   *(u8 *)(r0 \u002B 0);         /* verifier: map value; runtime: zero */ 2:   return 0;  The r6 == 0 path is explored first and the dereference is accepted. The r6 == 1 path is pruned at the checkpoint recorded for (1), so the comparison is never verified with a non-zero r6. At runtime a failed lookup returns NULL, NULL != 1 takes the non-NULL edge and the program dereferences a pointer that is zero.",
  "published": "2026-09-25T11:17:32Z",
  "severity": "",
  "epss": 0.00203,
  "epssPercentile": 0.1036,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98040",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98040",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}