{"id":"CVE-2026-58094","title":"The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object","summary":"The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object.  This is intended to be used immediately after creating the object, before any memory is allocated for the object.  The handler checked w…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-367"],"vendor":"freebsd","product":"freebsd","affected":["freebsd = 14.4","freebsd = 15.0","freebsd = 15.1"],"published":"2026-08-26","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:17:24.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-58094","references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:63.posixshm.asc","label":"secteam@freebsd.org"}],"tags":["nvd"],"epss":0.00111,"epssPercentile":0.01485,"ingestedAt":"2026-09-24T13:43:25.662Z","slug":"CVE-2026-58094","body":"## Overview\n\nThe FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object.  This is intended to be used immediately after creating the object, before any memory is allocated for the object.  The handler checked whether a page size had already been configured without holding the rangelock.  Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state.\n\nAn unprivileged local user can exploit this race to escalate privileges.\n\n## Affected\n\n- `freebsd = 14.4`\n- `freebsd = 15.0`\n- `freebsd = 15.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}