{
  "cveId": "CVE-2026-68462",
  "url": "https://patchblox.com/security/cve/CVE-2026-68462",
  "summary": "CVE-2026-68462 is fixed in linux on 1 platform by DEBIAN-CVE-2026-68462 (version 7.1.5-1), released August 15, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  bpf: Reject negative const offsets for buffer po...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Reject negative const offsets for buffer pointers  The verifier rejects variable offsets for PTR_TO_TP_BUFFER and PTR_TO_BUF accesses, but it currently accepts a constant negative offset produced by pointer arithmetic.  Commit 022ac0750883 (\u0022bpf: use reg-\u003Evar_off instead of reg-\u003Eoff for pointers\u0022) moved constant pointer offsets from reg-\u003Eoff to reg-\u003Evar_off. However, __check_buffer_access() continued to check only the instruction offset. An access with reg-\u003Evar_off equal to -8 and an instruction offset of zero therefore passes verification.  For writable raw tracepoints, the access end is also calculated from the unsigned reg-\u003Evar_off.value. An eight-byte access starting at -8 wraps the calculated end to zero, allowing the program to load and attach without increasing max_tp_access.  After ensuring that reg-\u003Evar_off is constant, calculate the effective access start using signed arithmetic and reject it when it is negative. Use the validated start to calculate the access end for both PTR_TO_TP_BUFFER and PTR_TO_BUF.",
  "published": "2026-08-15T06:18:39Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00165,
  "epssPercentile": 0.05762,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.5-1",
      "fix": "DEBIAN-CVE-2026-68462",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-68462",
      "released": "2026-08-15T22:38:55Z"
    }
  ],
  "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"
  }
}