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CVE

CVE-2026-53670

PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass eBPF verification
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CVE

CVE-2026-53670

PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass eBPF verification

PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, in the Prevail eBPF verifier, EbpfTransformer::add() silently skips offset-variable updates when the destination register carries a non-singleton typeset (two or more simultaneously possible pointer types). Subsequent bounds checks use the stale offset and accept out-of-bounds memory accesses, so a crafted BPF program passes verification even though it would corrupt memory at runtime. This issue has been patched in version 0.2.4.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/vbpf/prevail/releases/tag/v0.2.4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53670.json, https://github.com/vbpf/prevail/security/advisories/GHSA-2qc8-qh94-66rc, https://nvd.nist.gov/vuln/detail/CVE-2026-53670, https://github.com/vbpf/prevail/commit/2b209bc4e3d612ff9aca87125e67c0ff84477e61

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00507%
EPSS Percentile
0.41325%
Introduced Version
0
Fix Available
67b6d03ebaa3341e2eee2aa74502003fd11e31de

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