Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-53671— PREVAIL: Context-write no-op in do_mem_store allows unsafe eBPF programs to pass verification

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.

vbpf PREVAIL是vbpf组织的一款功能丰富的软件平台。 vbpf PREVAIL 0.2.4之前版本存在数字错误漏洞，该漏洞源于抽象转换器将通过T_CTX类型基本寄存器的写入视为静默无操作，且未检查AccessType::write，导致攻击者可构造eBPF程序覆盖上下文字段（如ctx->data）、将其重新加载为T_PACKET类型并取消引用攻击者控制的地址，而PREVAIL会误报该程序为安全。

CVSS 9.3 · Critical EPSS 0.51% · P43

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 1

VendorProduct Version RangeStatus
vbpf prevail < 0.2.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53671

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
PREVAIL: Context-write no-op in do_mem_store allows unsafe eBPF programs to pass verification
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 abstract transformer in prevail treats writes through a T_CTX-typed base register as a silent no-op: do_mem_store in src/crab/ebpf_transformer.cpp only models T_STACK stores, and the checker's T_CTX bounds arm never tests AccessType::write. An attacker can craft an eBPF program that overwrites a context field (e.g., ctx->data), reload that field typed as T_PACKET, and dereference an attacker-controlled address — and prevail will report the program as safe. 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:H/VI:H/VA:N/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
Vulnerability Title
vbpf PREVAIL 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vbpf PREVAIL是vbpf组织的一款功能丰富的软件平台。 vbpf PREVAIL 0.2.4之前版本存在数字错误漏洞，该漏洞源于抽象转换器将通过T_CTX类型基本寄存器的写入视为静默无操作，且未检查AccessType::write，导致攻击者可构造eBPF程序覆盖上下文字段（如ctx->data）、将其重新加载为T_PACKET类型并取消引用攻击者控制的地址，而PREVAIL会误报该程序为安全。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vbpf prevail < 0.2.4 -

II. Public POCs for CVE-2026-53671

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-53671

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-53671 (1)

Vendor Advisories for CVE-2026-53671 (1)

Vendor Pages for CVE-2026-53671 (1)

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

CVE-2026-53670 9.3 CRITICAL PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass e
CVE-2026-53706 8.8 HIGH PREVAIL: ALU32 pointer arithmetic accepted without is64 gate — verifier emits false PASS f

IV. Related Vulnerabilities

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