Double Free in NetBSD Src
CVE-2026-32848
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- NetBSD Src — versions 0
Weakness classification (CWE)
References
- github.com/NetBSD/src/commit/ec8451efc1565516aba9e7047e1a1a1ce7953a2f (patch)
- nasm.re/posts/uaf_netbsd_crypto/ (technical-description, exploit)
- www.vulncheck.com/advisories/netbsd-cryptodev-race-condition-double-free-via-cr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-32848?
- CVE-2026-32848 is a medium-severity vulnerability in NetBSD Src, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 4.7/10. Published 2026-05-18.
- How severe is CVE-2026-32848?
- Medium severity. CVSS v3 base score is 4.7 out of 10.