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NetBSD opencrypto EUVD-2026-30791

| CVE-2026-32848 MEDIUM
Race Condition (CWE-362)
2026-05-18 disclosure@vulncheck.com GHSA-5qv9-q5h2-c748
Information Disclosure Race Condition
5.7
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/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
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
May 18, 2026 - 18:37 vuln.today
Analysis Generated
May 18, 2026 - 18:37 vuln.today

DescriptionNVD

NetBSD prior to commit ec8451e contains a race condition vulnerability in cryptodev_op() within the opencrypto subsystem that allows local attackers to trigger a double-free condition by concurrently issuing CIOCCRYPT operations on the same session identifier on SMP systems. Attackers can exploit mutable per-operation state embedded in the csession struct to corrupt kernel heap memory.

AnalysisAI

Kernel heap corruption in NetBSD's opencrypto subsystem enables local privilege-adjacent attackers to crash the kernel via a double-free triggered by a race condition in cryptodev_op(). The flaw exists because mutable per-operation state - including tmp_iv, tmp_mac, iovec, and uio - was embedded directly in the shared csession struct rather than isolated per-operation, making it unsafely accessible across concurrent threads on SMP systems. …

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EUVD-2026-30791 vulnerability details – vuln.today
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