{"id":"CVE-2021-33655","title":"When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.","summary":"When sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.","severity":"medium","cvss":6.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787","CWE-787"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 5.19","linux_kernel = 5.19","debian_linux = 10.0","debian_linux = 11.0"],"patched":["linux_kernel 5.19"],"published":"2022-07-18","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:12.710","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-33655","references":[{"url":"http://www.openwall.com/lists/oss-security/2022/07/19/2","label":"securities@openeuler.org"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4","label":"securities@openeuler.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","label":"securities@openeuler.org"},{"url":"https://www.debian.org/security/2022/dsa-5191","label":"securities@openeuler.org"},{"url":"http://www.openwall.com/lists/oss-security/2022/07/19/2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=086ff84617185393a0bbf25830c4f36412a7d3f4","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2022/dsa-5191","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-794697.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.00315,"epssPercentile":0.22664,"ingestedAt":"2026-10-14T12:29:10.829Z","slug":"CVE-2021-33655","body":"## Overview\n\nWhen sending malicous data to kernel by ioctl cmd FBIOPUT_VSCREENINFO,kernel will write memory out of bounds.\n\n## Affected\n\n- `linux_kernel < 5.19`\n- `linux_kernel = 5.19`\n- `debian_linux = 10.0`\n- `debian_linux = 11.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.19`","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}