EUVD-2026-70245Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible verifier with unprivileged submission path; scope change because verified programs execute in kernel context; C:L for partial kernel pointer bits leaked via pointer truncation.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Verification bypass in prevail eBPF verifier versions before 0.2.4 allows any caller with eBPF program submission access - including unprivileged users on BPF-enabled kernels - to load programs that incorrectly pass safety checks but destroy the upper 32 bits of kernel pointer registers at runtime via ALU32 ADD and SUB instructions. The runtime effect is either a program fault (availability impact) or exposure of the lower 32 bits of a kernel pointer as a leakable scalar, partially defeating kernel ASLR. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target system uses prevail as its eBPF verifier and that the attacker can submit eBPF programs for verification. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.8 with AV:N/AC:L/PR:N reflects that prevail is commonly invoked for user-submitted programs, including from unprivileged callers, making the verifier surface broadly reachable. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to prevail v0.2.4 or later - vendor-released patch confirmed by GitHub release tag and advisory GHSA-65fp-5qmq-gg2m at https://github.com/vbpf/prevail/releases/tag/v0.2.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running PREVAIL eBPF verifier versions before 0.2.4 and apply the vendor patch to version 0.2.4 immediately. …
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Verifier bypass in PREVAIL (vbpf/prevail), the polynomial-runtime eBPF static verifier, before version 0.2.4 lets an att
Verifier bypass in PREVAIL, the polynomial-runtime eBPF verifier (used notably as the abstract-interpretation verifier i
Same weakness CWE-682 – Incorrect Calculation
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External POC / Exploit Code
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