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
Configurations
Configuration 1 (hide)
|
History
15 Jul 2026, 14:38
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-193 | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/1a113b5497297871699cd498b1b83542e0db7f15 - Patch | |
| References | () https://git.kernel.org/stable/c/1dd8be4ec722ce54e4cace59f3a4ba658111b3ec - Patch | |
| References | () https://git.kernel.org/stable/c/6927f0d6794aa73318bbfa929f1ff6065b0620df - Patch | |
| References | () https://git.kernel.org/stable/c/7fd3b41260c6120e7b60164afea5d961af6224f9 - Patch | |
| References | () https://git.kernel.org/stable/c/a5dfeb3b61065039488342d43ae06d4729d955d4 - Patch | |
| References | () https://git.kernel.org/stable/c/fb74defa1cca1a73177c0c761e641332e4f979a3 - Patch |
28 Jun 2026, 08:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
24 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-24 17:17
Updated : 2026-07-15 14:38
NVD link : CVE-2026-53036
Mitre link : CVE-2026-53036
CVE.ORG link : CVE-2026-53036
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-193
Off-by-one Error