{"id":"CVE-2026-57589","aliases":["EUVD-2026-39156","GHSA-w3gf-4959-2377"],"status":"published","title":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege...","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00169,"percentile":0.06377,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-06-25T00:33:04Z","modified":"2026-10-28T11:18:03Z","products":[{"vendor":"openbsd","product":"openbsd"}],"references":[{"url":"https://github.com/openbsd/src/commit/1957873d2063db11dab780eca75b5e629d1e838d","tags":["Patch","fix"]},{"url":"https://openai.com/index/patch-the-planet/","tags":["Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57589","tags":["advisory"]},{"url":"https://openai.com/index/patch-the-planet"},{"url":"https://github.com/advisories/GHSA-w3gf-4959-2377"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57589.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-57589","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","status":"published","published":"2026-06-25T00:33:04.749Z","modified":"2026-06-26T03:55:33.978Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T13:43:56.024247Z"}],"euvd":[{"id":"EUVD-2026-39156","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","status":"published","published":"2026-06-25T00:33:04Z","modified":"2026-06-26T03:55:33Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:20:25.316004Z"}],"ghsa":[{"id":"GHSA-w3gf-4959-2377","title":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege...","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","status":"published","published":"2026-06-25T03:31:40Z","modified":"2026-06-25T03:31:50Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:08:58.724463Z"}],"nvd":[{"id":"CVE-2026-57589","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","status":"published","published":"2026-06-25T01:16:26.537Z","modified":"2026-07-10T16:39:52.48Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:25.67873Z"}],"osv":[{"id":"CVE-2026-57589","description":"sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().","status":"published","published":"2026-06-25T00:33:04.749Z","modified":"2026-10-28T11:18:03.86646661Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:45:12.016252Z"}]}}