{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53036", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.380Z", "datePublished": "2026-06-24T16:29:43.449Z", "dateUpdated": "2026-08-05T12:32:47.252Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:47.252Z" }, "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 > 0 && imm >> bits) || (imm < 0 && ~imm >> bits) which admits\nvalues in [-2^N, 2^N) — 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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/net/bpf_jit_comp.c" ], "versions": [ { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "a5dfeb3b61065039488342d43ae06d4729d955d4", "status": "affected", "versionType": "git" }, { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "7fd3b41260c6120e7b60164afea5d961af6224f9", "status": "affected", "versionType": "git" }, { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "6927f0d6794aa73318bbfa929f1ff6065b0620df", "status": "affected", "versionType": "git" }, { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "1a113b5497297871699cd498b1b83542e0db7f15", "status": "affected", "versionType": "git" }, { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "fb74defa1cca1a73177c0c761e641332e4f979a3", "status": "affected", "versionType": "git" }, { "version": "e54bcde3d69d40023ae77727213d14f920eb264a", "lessThan": "1dd8be4ec722ce54e4cace59f3a4ba658111b3ec", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/net/bpf_jit_comp.c" ], "versions": [ { "version": "3.18", "status": "affected" }, { "version": "0", "lessThan": "3.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.18", "versionEndExcluding": "7.1" } ] } ] } ], "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" } } } }