{"id":"CVE-2021-4002","details":"A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.","modified":"2026-02-11T13:26:20.155111Z","published":"2022-03-03T22:15:08.527Z","related":["ALSA-2022:1988","MGASA-2021-0538","MGASA-2021-0539","SUSE-SU-2022:0056-1","SUSE-SU-2022:0068-1","SUSE-SU-2022:0079-1","SUSE-SU-2022:0080-1","SUSE-SU-2022:0090-1","SUSE-SU-2022:0131-1","SUSE-SU-2022:0181-1","SUSE-SU-2022:0197-1","SUSE-SU-2022:0362-1","SUSE-SU-2022:0366-1","SUSE-SU-2022:0367-1","SUSE-SU-2022:0371-1","SUSE-SU-2022:0477-1","openSUSE-SU-2022:0056-1","openSUSE-SU-2022:0131-1","openSUSE-SU-2022:0366-1"],"references":[{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2025726"},{"type":"ADVISORY","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea"},{"type":"ADVISORY","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5096"},{"type":"ADVISORY","url":"https://www.openwall.com/lists/oss-security/2021/11/25/1"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2025726"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujul2022.html"},{"type":"ARTICLE","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html"},{"type":"ARTICLE","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"},{"type":"ARTICLE","url":"https://www.openwall.com/lists/oss-security/2021/11/25/1"},{"type":"EVIDENCE","url":"https://www.openwall.com/lists/oss-security/2021/11/25/1"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git","events":[{"introduced":"0"},{"fixed":"13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea"},{"introduced":"0"},{"fixed":"a4a118f2eead1d6c49e00765de89878288d4b890"}]}],"versions":["v2.6.12","v2.6.12-rc2","v2.6.12-rc3","v2.6.12-rc4","v2.6.12-rc5","v2.6.12-rc6","v2.6.13","v2.6.13-rc1","v2.6.13-rc2","v2.6.13-rc3","v2.6.13-rc4","v2.6.13-rc5","v2.6.13-rc6","v2.6.13-rc7","v2.6.14","v2.6.14-rc1","v2.6.14-rc2","v2.6.14-rc3","v2.6.14-rc4","v2.6.14-rc5","v2.6.15","v2.6.15-rc1","v2.6.15-rc2","v2.6.15-rc3","v2.6.15-rc4","v2.6.15-rc5","v2.6.15-rc6","v2.6.15-rc7","v2.6.16","v2.6.16-rc1","v2.6.16-rc2","v2.6.16-rc3","v2.6.16-rc4","v2.6.16-rc5","v2.6.16-rc6","v2.6.17","v2.6.17-rc1","v2.6.17-rc2","v2.6.17-rc3","v2.6.17-rc4","v2.6.17-rc5","v2.6.17-rc6","v2.6.18","v2.6.18-rc1","v2.6.18-rc2","v2.6.18-rc3","v2.6.18-rc4","v2.6.18-rc5","v2.6.18-rc6","v2.6.18-rc7","v2.6.19","v2.6.19-rc1","v2.6.19-rc2","v2.6.19-rc3","v2.6.19-rc4","v2.6.19-rc5","v2.6.19-rc6","v2.6.20","v2.6.20-rc1","v2.6.20-rc2","v2.6.20-rc3","v2.6.20-rc4","v2.6.20-rc5","v2.6.20-rc6","v2.6.20-rc7","v2.6.21","v2.6.21-rc1","v2.6.21-rc2","v2.6.21-rc3","v2.6.21-rc4","v2.6.21-rc5","v2.6.21-rc6","v2.6.21-rc7","v2.6.22","v2.6.22-rc1","v2.6.22-rc2","v2.6.22-rc3","v2.6.22-rc4","v2.6.22-rc5","v2.6.22-rc6","v2.6.22-rc7","v2.6.23","v2.6.23-rc1","v2.6.23-rc2","v2.6.23-rc3","v2.6.23-rc4","v2.6.23-rc5","v2.6.23-rc6","v2.6.23-rc7","v2.6.23-rc8","v2.6.23-rc9","v2.6.24","v2.6.24-rc1","v2.6.24-rc2","v2.6.24-rc3","v2.6.24-rc4","v2.6.24-rc5","v2.6.24-rc6","v2.6.24-rc7","v2.6.24-rc8","v2.6.25","v2.6.25-rc1","v2.6.25-rc2","v2.6.25-rc3","v2.6.25-rc4","v2.6.25-rc5","v2.6.25-rc6","v2.6.25-rc7","v2.6.25-rc8","v2.6.25-rc9","v2.6.26","v2.6.26-rc1","v2.6.26-rc2","v2.6.26-rc3","v2.6.26-rc4","v2.6.26-rc5","v2.6.26-rc6","v2.6.26-rc7","v2.6.26-rc8","v2.6.26-rc9","v2.6.27","v2.6.27-rc1","v2.6.27-rc2","v2.6.27-rc3","v2.6.27-rc4","v2.6.27-rc5","v2.6.27-rc6","v2.6.27-rc7","v2.6.27-rc8","v2.6.27-rc9","v2.6.28","v2.6.28-rc1","v2.6.28-rc2","v2.6.28-rc3","v2.6.28-rc4","v2.6.28-rc5","v2.6.28-rc6","v2.6.28-rc7","v2.6.28-rc8","v2.6.28-rc9","v2.6.29","v2.6.29-rc1","v2.6.29-rc2","v2.6.29-rc3","v2.6.29-rc4","v2.6.29-rc5","v2.6.29-rc6","v2.6.29-rc7","v2.6.29-rc8","v2.6.30","v2.6.30-rc1","v2.6.30-rc2","v2.6.30-rc3","v2.6.30-rc4","v2.6.30-rc5","v2.6.30-rc6","v2.6.30-rc7","v2.6.30-rc8","v2.6.31","v2.6.31-rc1","v2.6.31-rc2","v2.6.31-rc3","v2.6.31-rc4","v2.6.31-rc5","v2.6.31-rc6","v2.6.31-rc7","v2.6.31-rc8","v2.6.31-rc9","v2.6.32","v2.6.32-rc1","v2.6.32-rc2","v2.6.32-rc3","v2.6.32-rc4","v2.6.32-rc5","v2.6.32-rc6","v2.6.32-rc7","v2.6.32-rc8","v2.6.33","v2.6.33-rc1","v2.6.33-rc2","v2.6.33-rc3","v2.6.33-rc4","v2.6.33-rc5","v2.6.33-rc6","v2.6.33-rc7","v2.6.33-rc8","v2.6.34","v2.6.34-rc1","v2.6.34-rc2","v2.6.34-rc3","v2.6.34-rc4","v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