{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58087", "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "state": "PUBLISHED", "assignerShortName": "freebsd", "dateReserved": "2026-06-29T01:40:17.498Z", "datePublished": "2026-08-19T07:47:50.665Z", "dateUpdated": "2026-08-19T07:47:50.665Z"}, "containers": {"cna": {"datePublic": "2026-07-29T22:40:00.000Z", "title": "Heap out-of-bounds access in semctl(2)", "references": [{"tags": ["vendor-advisory"], "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:54.sysvsem.asc"}], "affected": [{"defaultStatus": "unknown", "modules": ["sysvsem"], "product": "FreeBSD", "vendor": "FreeBSD", "versions": [{"status": "affected", "versionType": "release", "version": "15.1-RELEASE", "lessThan": "p2"}, {"status": "affected", "versionType": "release", "version": "15.0-RELEASE", "lessThan": "p12"}, {"status": "affected", "versionType": "release", "version": "14.4-RELEASE", "lessThan": "p8"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Maik Muench of Secfault Security"}], "descriptions": [{"lang": "en", "value": "The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized for that count, and reacquired the lock. A sequence-number check was used to verify that the set had not been replaced in the interim, but the sequence number wraps after 0x8000 create/destroy cycles. By rapidly destroying and recreating semaphore sets at the same index, another process can cause the sequence number to wrap, allowing a set with a different number of semaphores to pass validation. The subsequent copy then reads or writes past the end of the allocated buffer.\n\nAn unprivileged local user can trigger out-of-bounds reads and writes on kernel heap memory, potentially leading to privilege escalation."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-191", "description": "CWE-191: Integer Underflow (Wrap or Wraparound)", "lang": "en", "type": "CWE"}, {"cweId": "CWE-125", "description": "CWE-125: Out-of-bounds Read", "lang": "en", "type": "CWE"}, {"cweId": "CWE-787", "description": "CWE-787: Out-of-bounds Write", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "63664ac6-956c-4cba-a5d0-f46076e16109", "shortName": "freebsd", "dateUpdated": "2026-08-19T07:47:50.665Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["sysvsem"], "product": "FreeBSD", "vendor": "FreeBSD", "versions": [{"lessThan": "p2", "status": "affected", "version": "15.1-RELEASE", "versionType": "release"}, {"lessThan": "p12", "status": "affected", "version": "15.0-RELEASE", "versionType": "release"}, {"lessThan": "p8", "status": "affected", "version": "14.4-RELEASE", "versionType": "release"}]}], "source": "secteam@freebsd.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The GETALL and SETALL commands in semctl(2) recorded the number of semaphores in the target set, dropped the lock protecting the set, allocated a buffer sized for that count, and reacquired the lock. A sequence-number check was used to verify that the set had not been replaced in the interim, but the sequence number wraps after 0x8000 create/destroy cycles. By rapidly destroying and recreating semaphore sets at the same index, another process can cause the sequence number to wrap, allowing a set with a different number of semaphores to pass validation. The subsequent copy then reads or writes past the end of the allocated buffer.\n\nAn unprivileged local user can trigger out-of-bounds reads and writes on kernel heap memory, potentially leading to privilege escalation."}], "id": "CVE-2026-58087", "lastModified": "2026-08-19T08:17:12.877", "metrics": {}, "published": "2026-08-19T08:17:12.877", "references": [{"source": "secteam@freebsd.org", "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:54.sysvsem.asc"}], "sourceIdentifier": "secteam@freebsd.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-191"}, {"lang": "en", "value": "CWE-787"}], "source": "secteam@freebsd.org", "type": "Secondary"}]}

{}

{}