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CVE-2026-53706— PREVAIL: ALU32 pointer arithmetic accepted without is64 gate — verifier emits false PASS for pointer-corrupting programs

Quick assessment

Affected
vbpf prevail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PREVAIL 是一个基于抽象解释层的多项式运行时 eBPF 验证器。在 0.2.4 版本之前，PREVAIL eBPF 验证器接受对指针类型寄存器执行 ALU32 加法（ADD）和减法（SUB）指令，但未检查 is64 标志位。由于 ALU32 算术运算会将 32 位结果进行零扩展，因此在运行时指针的高 32 位会被静默破坏，而 PREVAIL 仍将该程序标记为“验证通过/安全”。任何能够提交 eBPF 程序进行验证的调用方——包括在内核允许加载 BPF 程序的环境中，甚至非特权用户——都可以构造一个能够通过验证

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
vbpf prevail < 0.2.4 affected
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I. Basic Information for CVE-2026-53706

Vulnerability Information
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Vulnerability Title
PREVAIL: ALU32 pointer arithmetic accepted without is64 gate — verifier emits false PASS for pointer-corrupting programs
Source: CVE Program / CVE List V5
Vulnerability Description
PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the prevail eBPF verifier accepts ALU32 ADD and SUB instructions that operate on pointer-typed registers without checking the is64 flag. Because ALU32 arithmetic zero-extends the 32-bit result, the upper half of any pointer is silently destroyed at runtime, yet prevail marks the program as verified safe. Any caller that can submit an eBPF program for verification — including unprivileged users on kernels that permit BPF program loading — can produce a program that passes verification but faults or misbehaves at runtime. This issue has been patched in version 0.2.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vbpf prevail < 0.2.4 -

II. Public POCs for CVE-2026-53706

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III. Intelligence Information for CVE-2026-53706

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Patches & Fixes for CVE-2026-53706 (1)

Vendor Advisories for CVE-2026-53706 (1)

Vendor Pages for CVE-2026-53706 (1)

Same Patch Batch · vbpf · 2026-09-02 · 3 CVEs total

CVE-2026-53671 9.3 CRITICAL PREVAIL: Context-write no-op in do_mem_store allows unsafe eBPF programs to pass verificat
CVE-2026-53670 9.3 CRITICAL PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass e

IV. Related Vulnerabilities

Same product: prevail
Same vendor: vbpf
Same weakness: CWE-682

V. Comments for CVE-2026-53706

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