{
  "cveId": "CVE-2026-53036",
  "url": "https://patchblox.com/security/cve/CVE-2026-53036",
  "summary": "CVE-2026-53036 is fixed in 70 products on 1 platform, first by ALAS2023-2026-1882, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "bpf, arm64: Fix off-by-one in check_imm signed range check",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf, arm64: Fix off-by-one in check_imm signed range check  check_imm(bits, imm) is used in the arm64 BPF JIT to verify that a branch displacement (in arm64 instruction units) fits into the signed N-bit immediate field of a B, B.cond or CBZ/CBNZ encoding before it is handed to the encoder. The macro currently tests for (imm \u003E 0 \u0026\u0026 imm \u003E\u003E bits) || (imm \u003C 0 \u0026\u0026 ~imm \u003E\u003E bits) which admits values in [-2^N, 2^N) \u2014 effectively a signed (N\u002B1)-bit range. A signed N-bit field only holds [-2^(N-1), 2^(N-1)), so the check admits one extra bit of range on each side.  In particular, for check_imm19(), values in [2^18, 2^19) slip past the check but do not fit into the 19-bit signed imm19 field of B.cond. aarch64_insn_encode_immediate() then masks the raw value into the 19-bit field, setting bit 18 (the sign bit) and flipping a forward branch into a backward one. Same class of issue exists for check_imm26() and the B/BL encoding. Shift by (bits - 1) instead of bits so the actual signed N-bit range is enforced.",
  "published": "2026-06-22T09:00:00Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00139,
  "epssPercentile": 0.03259,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53036",
  "fixes": [
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      "platform": "linux",
      "product": "bpftool",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.175-219.357.amzn2023",
      "fix": "ALAS2023-2026-1882",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1882",
      "released": "2026-06-22T09:00:00Z"
    },
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      "product": "bpftool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.1.175-219.357.amzn2023",
      "fix": "ALAS2023-2026-1882",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1882",
      "released": "2026-06-22T09:00:00Z"
    },
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      "platform": "linux",
      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.92-122.166.amzn2023",
      "fix": "ALAS2023-2026-1894",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1894",
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      "release": "amzn 2023",
      "fixedVersion": "1:6.12.92-122.166.amzn2023",
      "fix": "ALAS2023-2026-1894",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1894",
      "released": "2026-06-22T09:00:00Z"
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      "fix": "ALAS2023-2026-1866",
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      "product": "bpftool6.18-debuginfo",
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      "fix": "ALAS2023-2026-1866",
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