{"id":"CVE-2021-34693","title":"net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.","summary":"net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-909"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.25, <= 5.12.10","debian_linux = 9.0","debian_linux = 10.0"],"published":"2021-06-14","updated":"2026-10-08","sourceUpdated":"2026-10-08T21:17:36.107","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-34693","references":[{"url":"http://www.openwall.com/lists/oss-security/2021/06/15/1","label":"cve@mitre.org"},{"url":"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html","label":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html","label":"cve@mitre.org"},{"url":"https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/","label":"cve@mitre.org"},{"url":"https://www.debian.org/security/2021/dsa-4941","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2021/06/15/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4941","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00472,"epssPercentile":0.38968,"ingestedAt":"2026-10-08T22:11:53.736Z","slug":"CVE-2021-34693","body":"## Overview\n\nnet/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.\n\n## Affected\n\n- `linux_kernel >= 2.6.25, <= 5.12.10`\n- `debian_linux = 9.0`\n- `debian_linux = 10.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}