{"id":"CVE-2026-49416","aliases":["EUVD-2026-39960","GHSA-f3p8-j3ww-gvq7"],"status":"published","title":"Integer overflow in vt(4) CONS_HISTORY ioctl","description":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected.  Subsequent initialization of the buffer wrote beyond the end of the allocation.\n\nAn unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.","severity":{"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":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00153,"percentile":0.04542,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190"],"published":"2026-06-27T09:25:12Z","modified":"2026-07-01T14:04:11Z","products":[{"vendor":"freebsd","product":"freebsd"}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:34.vt.asc","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49416"},{"url":"https://github.com/advisories/GHSA-f3p8-j3ww-gvq7"}],"sources":{"cve":[{"id":"CVE-2026-49416","title":"Integer overflow in vt(4) CONS_HISTORY ioctl","description":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected.  Subsequent initialization of the buffer wrote beyond the end of the allocation.\n\nAn unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.","status":"published","published":"2026-06-27T09:25:12.443Z","modified":"2026-06-30T03:55:30.184Z","cvss":[{"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":"adp"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T13:34:59.78118Z"}],"euvd":[{"id":"EUVD-2026-39960","description":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected.  Subsequent initialization of the buffer wrote beyond the end of the allocation.\n\nAn unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.","status":"published","published":"2026-06-27T09:25:12Z","modified":"2026-06-30T03:55:30Z","cvss":[{"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"}],"updated_at":"2026-11-02T18:20:22.124605Z"}],"ghsa":[{"id":"GHSA-f3p8-j3ww-gvq7","title":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large...","description":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected.  Subsequent initialization of the buffer wrote beyond the end of the allocation.\n\nAn unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.","status":"published","published":"2026-06-27T12:30:51Z","modified":"2026-06-29T21:32:03Z","cvss":[{"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"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:09:04.017394Z"}],"nvd":[{"id":"CVE-2026-49416","description":"The CONS_HISTORY ioctl handler did not adequately validate the requested history size.  A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected.  Subsequent initialization of the buffer wrote beyond the end of the allocation.\n\nAn unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.","status":"published","published":"2026-06-27T10:16:38.077Z","modified":"2026-07-01T14:04:11.063Z","cvss":[{"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":"secondary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:12:26.508751Z"}]}}