CVE-2026-32849 Details
Description
NetBSD prior to commit ec8451e contains a signed integer overflow vulnerability in the cryptodev_op() function in sys/opencrypto/cryptodev.c where the local variable iov_len is declared as a signed int but assigned from an unsigned cop->dst_len value, causing undefined behavior when cop->dst_len exceeds INT_MAX. A local attacker with access to /dev/crypto and a compression session type can exploit this vulnerability by providing a dst_len value exceeding INT_MAX to trigger a kernel panic through NULL pointer dereference when CONFIG_SVS is disabled and corrupted UIO pointer arithmetic.
A signed integer overflow vulnerability has been identified in NetBSD versions prior to commit ec8451e. The issue resides in the cryptodev_op() function within sys/opencrypto/cryptodev.c. The vulnerability occurs because the local variable iov_len is declared as a signed integer but is assigned from an unsigned cop->dst_len value. This discrepancy creates undefined behavior when cop->dst_len exceeds INT_MAX. A local attacker with access to /dev/crypto and a compression session type can exploit this vulnerability by providing a dst_len value that exceeds INT_MAX. This exploitation triggers a kernel panic by causing a NULL pointer dereference, particularly when CONFIG_SVS is disabled, leading to corrupted UIO pointer arithmetic.
Users should update to a version of NetBSD that includes the patch for this vulnerability, available in the NetBSD GitHub repository.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 18, 2026CISA-ADP
Assessed May 18, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/NetBSD/src/commit/ec8451efc1565516aba9e7047e1a1a1ce7953a2f | [email protected] | Source CodeVendor |
| https://nasm.re/posts/uaf_netbsd_crypto/ | [email protected] | BundleExploitTechnical Analysis |
| https://www.vulncheck.com/advisories/netbsd-signed-integer-overflow-in-cryptodev-op-via-cryptodev-c | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| NetBSD | < commit ec8451e |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 18, 2026 | New CVE Received | [email protected] |