{"id":"CVE-2018-12633","aliases":["DEBIAN-CVE-2018-12633","EUVD-2018-4589","GHSA-9rwp-mqvh-8g6q","UBUNTU-CVE-2018-12633"],"status":"published","title":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers...","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","severity":{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.0026,"percentile":0.17862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-362"],"published":"2018-06-22T00:00:00Z","modified":"2026-10-23T18:03:53Z","exploits":[{"source":"pocgithub","id":"wiliam227user/CVE-2018-12633-TPLink-Auth-Bypass","title":"wiliam227user/CVE-2018-12633-TPLink-Auth-Bypass","date":"2025-12-31","url":"https://github.com/wiliam227user/CVE-2018-12633-TPLink-Auth-Bypass"}],"fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["4.17.3-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["4.17.3-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["4.17.3-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.3-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.3-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.3-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.4-dfsg-2","5.0.8-dfsg-1","5.0.10-dfsg-1","5.0.10-dfsg-2","5.0.10-dfsg-3","5.0.10-dfsg-4","5.0.10-dfsg-5","5.0.10-dfsg-6","5.0.10-dfsg-7","5.0.12-dfsg-1","5.0.12-dfsg-2","5.0.14-dfsg-1","5.0.14-dfsg-2","5.0.14-dfsg-2build1","5.0.16-dfsg-2","5.0.16-dfsg-3","5.0.18-dfsg-1","5.0.18-dfsg-1ubuntu1","5.0.18-dfsg-2","5.0.18-dfsg-2build1","5.0.18-dfsg-2ubuntu1","5.0.24-dfsg-0ubuntu1.16.04.1","5.0.32-dfsg-0ubuntu1.16.04.2","5.0.36-dfsg-0ubuntu1.16.04.2","5.0.40-dfsg-0ubuntu1.16.04.1","5.0.40-dfsg-0ubuntu1.16.04.2","5.1.34-dfsg-0ubuntu1.16.04.2","5.1.38-dfsg-0ubuntu1.16.04.1","5.1.38-dfsg-0ubuntu1.16.04.2","5.1.38-dfsg-0ubuntu1.16.04.3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.1.30-dfsg-1","5.2.0-dfsg-1build2","5.2.0-dfsg-2","5.2.0-dfsg-4","5.2.0-dfsg-5","5.2.2-dfsg-2","5.2.2-dfsg-3~build1","5.2.2-dfsg-3","5.2.4-dfsg-1","5.2.4-dfsg-2","5.2.6-dfsg-1","5.2.6-dfsg-2","5.2.6-dfsg-3","5.2.6-dfsg-3build1","5.2.6-dfsg-5","5.2.8-dfsg-2","5.2.8-dfsg-3","5.2.8-dfsg-5","5.2.8-dfsg-6","5.2.8-dfsg-7","5.2.10-dfsg-1","5.2.10-dfsg-2","5.2.10-dfsg-5","5.2.10-dfsg-6","5.2.10-dfsg-6ubuntu18.04.1","5.2.18-dfsg-2~ubuntu18.04.1","5.2.18-dfsg-2~ubuntu18.04.3","5.2.18-dfsg-2~ubuntu18.04.5","5.2.32-dfsg-0~ubuntu18.04.1","5.2.34-dfsg-0~ubuntu18.04.1","5.2.42-dfsg-0~ubuntu1.18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.14-dfsg-1","6.0.14-dfsg-2~build1","6.0.14-dfsg-2","6.1.0-dfsg-3build1","6.1.0-dfsg-3build2","6.1.2-dfsg-1","6.1.2-dfsg-1build1","6.1.4-dfsg-1","6.1.4-dfsg-2~build1","6.1.4-dfsg-2","6.1.4-dfsg-4","6.1.6-dfsg-1","6.1.10-dfsg-1~ubuntu1.20.04.1","6.1.16-dfsg-6~ubuntu1.20.04.1","6.1.16-dfsg-6~ubuntu1.20.04.2","6.1.22-dfsg-2~ubuntu1.20.04.1","6.1.26-dfsg-3~ubuntu1.20.04.1","6.1.26-dfsg-3~ubuntu1.20.04.2","6.1.32-dfsg-1~ubuntu1.20.04.1","6.1.34-dfsg-3~ubuntu1.20.04.1","6.1.38-dfsg-3~ubuntu1.20.04.1","6.1.48-dfsg-1~ubuntu1.20.04.1","6.1.50-dfsg-1~ubuntu1.20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"linux-intel-iot-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.0-1073.75"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"linux-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.0-1032.35"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.1.26-dfsg-4","6.1.28-dfsg-1","6.1.30-dfsg-1","6.1.32-dfsg-1","6.1.32-dfsg-1build1","6.1.34-dfsg-3~ubuntu1.22.04.1","6.1.38-dfsg-3~ubuntu1.22.04.1","6.1.48-dfsg-1~ubuntu1.22.04.1","6.1.50-dfsg-1~ubuntu1.22.04.1","6.1.50-dfsg-1~ubuntu1.22.04.3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"linux-raspi-realtime","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.8.0-2019.20"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.10-dfsg-3","7.0.12-dfsg-1","7.0.12-dfsg-1build1","7.0.14-dfsg-1","7.0.14-dfsg-2","7.0.14-dfsg-4","7.0.14-dfsg-4build4","7.0.14-dfsg-4build5","7.0.16-dfsg-1","7.0.16-dfsg-2","7.0.16-dfsg-2ubuntu1","7.0.16-dfsg-2ubuntu1.1","7.0.16-dfsg-2ubuntu1.3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"virtualbox","ranges":[{"type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Tracking","Vendor Advisory","report"]},{"url":"https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-12633"},{"url":"https://github.com/advisories/GHSA-9rwp-mqvh-8g6q"},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-12633","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-12633","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-12633","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-12633","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:00:00Z","modified":"2024-08-05T08:38:06.382Z","updated_at":"2026-11-02T14:35:06.679212Z"}],"euvd":[{"id":"EUVD-2018-4589","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:00:00Z","modified":"2024-08-05T08:38:06Z","updated_at":"2026-11-03T02:39:52.08472Z"}],"ghsa":[{"id":"GHSA-9rwp-mqvh-8g6q","title":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers...","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2022-05-14T03:05:51Z","modified":"2023-02-02T05:07:11Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:52:27.395685Z"}],"nvd":[{"id":"CVE-2018-12633","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:29:00.27Z","modified":"2026-06-17T01:38:05.937Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":6.3,"vector":"AV:L/AC:M/Au:N/C:C/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:04:30.900603Z"}],"osv":[{"id":"CVE-2018-12633","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:29:00.27Z","modified":"2026-03-14T14:32:13.64948Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:07.934182Z"},{"id":"DEBIAN-CVE-2018-12633","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:29:00.27Z","modified":"2026-10-23T18:03:53.988831215Z","cvss":[{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:30.290351Z"},{"id":"UBUNTU-CVE-2018-12633","description":"An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.","status":"published","published":"2018-06-22T00:29:00Z","modified":"2026-10-17T12:54:19.029913493Z","cvss":[{"version":"4.0","score":7.3,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"high"},{"version":"3.0","score":6.3,"vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:17.014176Z"}]}}