{"id":"CVE-2026-57843","revision":"d64be2444c6e4bd3b71c491fcab9b4e8","records":[{"revision":"d64be2444c6e4bd3b71c491fcab9b4e8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-57843","aliases":[],"title":"NetBSD mm_open() PK_KMEM Flag Kernel Pointer Information Disclosure","description":"NetBSD contains an information disclosure vulnerability in mm_open() within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PK_KMEM process flag. Attackers can exploit this misconfigured flag to bypass the CANSEE_KPTR obfuscation mechanism and read kernel virtual addresses for sensitive kernel structures including struct proc, kauth_cred, filedesc, and vmspace via sysctl KERN_PROC queries.","state":0,"publishedAt":"2026-09-11T13:50:32.448+00:00","modifiedAt":"2026-10-01T15:20:05.278+00:00","affected":[{"ecosystem":"Vendor product","name":"NetBSD","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"The NetBSD Foundation\",\n                    \"product\": \"NetBSD\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"9.0\",\n                            \"versionType\": \"custom\",\n                            \"lessThan\": \"9.5\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"10.0\",\n                            \"versionType\": \"custom\",\n                            \"lessThanOrEqual\": \"10.1\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.8,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.5,"severity":"MEDIUM"}],"references":["https://gnats.netbsd.org/60373","https://www.vulncheck.com/advisories/netbsd-mm-open-pk-kmem-flag-kernel-pointer-information-disclosure"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-57843","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-57843","identifiers":["CVE-2026-57843"]},"retained":false,"historicalAffected":[]}],"coverage":[]}