bpf, arm64: Fix off-by-one in check_imm signed range check

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53036
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:15 UTC
Updated2026-07-15 14:38:18 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001380000 probability, percentile 0.036270000 (date 2026-07-13)

Problem Types: CWE-193

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a a5dfeb3b61065039488342d43ae06d4729d955d4 git Not specified
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a 7fd3b41260c6120e7b60164afea5d961af6224f9 git Not specified
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a 6927f0d6794aa73318bbfa929f1ff6065b0620df git Not specified
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a 1a113b5497297871699cd498b1b83542e0db7f15 git Not specified
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a fb74defa1cca1a73177c0c761e641332e4f979a3 git Not specified
CNA Linux Linux affected e54bcde3d69d40023ae77727213d14f920eb264a 1dd8be4ec722ce54e4cace59f3a4ba658111b3ec git Not specified
CNA Linux Linux affected 3.18 Not specified
CNA Linux Linux unaffected 3.18 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1a113b5497297871699cd498b1b83542e0db7f15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a5dfeb3b61065039488342d43ae06d4729d955d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7fd3b41260c6120e7b60164afea5d961af6224f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1dd8be4ec722ce54e4cace59f3a4ba658111b3ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6927f0d6794aa73318bbfa929f1ff6065b0620df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fb74defa1cca1a73177c0c761e641332e4f979a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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