CVE-2026-32848

NetBSD cryptodev Race Condition Double-Free via cryptodev_op()

State: Published
Severity: 5.7 Medium
Published: May 18, 2026
Updated: Jul 14, 2026
Reserved: Mar 16, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.7 Medium	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	VulnCheck
3.1	4.7 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-415 Double Free
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
srcNetBSD	before ec8451efc1565516aba9e7047e1a1a1ce7953a2fAffected

References

https://nasm.re/posts/uaf_netbsd_crypto/technical-descriptionexploit
https://github.com/NetBSD/src/commit/ec8451efc1565516aba9e7047e1a1a1ce7953a2fpatch
https://www.vulncheck.com/advisories/netbsd-cryptodev-race-condition-double-free-via-cryptodev-opthird-party-advisory

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