CVE-2026-53036 (GCVE-0-2026-53036)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-08-05 12:32
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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 > 0 && imm >> bits) || (imm < 0 && ~imm >> bits) which admits values in [-2^N, 2^N) — effectively a signed (N+1)-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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e54bcde3d69d40023ae77727213d14f920eb264a
Version: e54bcde3d69d40023ae77727213d14f920eb264a
Version: e54bcde3d69d40023ae77727213d14f920eb264a
Version: e54bcde3d69d40023ae77727213d14f920eb264a
Version: e54bcde3d69d40023ae77727213d14f920eb264a
Version: e54bcde3d69d40023ae77727213d14f920eb264a
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/net/bpf_jit_comp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a5dfeb3b61065039488342d43ae06d4729d955d4",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            },
            {
              "lessThan": "7fd3b41260c6120e7b60164afea5d961af6224f9",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            },
            {
              "lessThan": "6927f0d6794aa73318bbfa929f1ff6065b0620df",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            },
            {
              "lessThan": "1a113b5497297871699cd498b1b83542e0db7f15",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            },
            {
              "lessThan": "fb74defa1cca1a73177c0c761e641332e4f979a3",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            },
            {
              "lessThan": "1dd8be4ec722ce54e4cace59f3a4ba658111b3ec",
              "status": "affected",
              "version": "e54bcde3d69d40023ae77727213d14f920eb264a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/net/bpf_jit_comp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "lessThan": "3.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, arm64: Fix off-by-one in check_imm signed range check\n\ncheck_imm(bits, imm) is used in the arm64 BPF JIT to verify that\na branch displacement (in arm64 instruction units) fits into the\nsigned N-bit immediate field of a B, B.cond or CBZ/CBNZ encoding\nbefore it is handed to the encoder. The macro currently tests for\n(imm \u003e 0 \u0026\u0026 imm \u003e\u003e bits) || (imm \u003c 0 \u0026\u0026 ~imm \u003e\u003e bits) which admits\nvalues in [-2^N, 2^N) \u2014 effectively a signed (N+1)-bit range. A\nsigned N-bit field only holds [-2^(N-1), 2^(N-1)), so the check\nadmits one extra bit of range on each side.\n\nIn particular, for check_imm19(), values in [2^18, 2^19) slip past\nthe check but do not fit into the 19-bit signed imm19 field of\nB.cond. aarch64_insn_encode_immediate() then masks the raw value\ninto the 19-bit field, setting bit 18 (the sign bit) and flipping\na forward branch into a backward one. Same class of issue exists\nfor check_imm26() and the B/BL encoding. Shift by (bits - 1)\ninstead of bits so the actual signed N-bit range is enforced."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable arm64 BPF JIT code is reached by a local attacker through the bpf() syscall with BPF_PROG_LOAD, not by remote packets or adjacent/physical access.\nAC:L - Triggering is deterministic once the attacker can load a suitably large BPF program on an arm64 kernel with BPF JIT enabled; there is no race or victim state dependency.\nPR:L - The oversized program needed to hit the bad immediate range requires privileged BPF loading, but BPF tokens/namespaced delegation make this reachable with non-host-root delegated privileges in plausible deployments. Under the required uncertainty rule, PR:L is the higher-severity defensible choice over PR:H.\nUI:N - No victim action is required after the attacker submits and runs the crafted BPF program.\nS:U - The vulnerability affects kernel execution within the same host security authority and is a standard local kernel compromise path, not a VM/container boundary escape by itself.\nC:H - The JIT can emit a verifier-unmodeled branch into attacker-shaped native BPF code, a BPF JIT verifier-bypass class issue that can plausibly yield arbitrary kernel memory read.\nI:H - The miscompiled branch can redirect execution through unintended JIT code paths, making arbitrary kernel code execution or write primitives defensible.\nA:H - Even without full exploitation, the invalid native control flow can reliably crash or hang kernel execution when the malformed BPF program runs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:47.252Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a5dfeb3b61065039488342d43ae06d4729d955d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7fd3b41260c6120e7b60164afea5d961af6224f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/6927f0d6794aa73318bbfa929f1ff6065b0620df"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a113b5497297871699cd498b1b83542e0db7f15"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb74defa1cca1a73177c0c761e641332e4f979a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1dd8be4ec722ce54e4cace59f3a4ba658111b3ec"
        }
      ],
      "title": "bpf, arm64: Fix off-by-one in check_imm signed range check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53036",
    "datePublished": "2026-06-24T16:29:43.449Z",
    "dateReserved": "2026-06-09T07:44:35.380Z",
    "dateUpdated": "2026-08-05T12:32:47.252Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.