{"id":"CVE-2021-33909","details":"fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.","aliases":["A-195082750","ASB-A-195082750"],"modified":"2026-05-13T12:02:32.020487378Z","published":"2021-07-20T19:15:09.747Z","related":["ALSA-2021:2714","SUSE-SU-2021:2406-1","SUSE-SU-2021:2407-1","SUSE-SU-2021:2408-1","SUSE-SU-2021:2409-1","SUSE-SU-2021:2415-1","SUSE-SU-2021:2416-1","SUSE-SU-2021:2421-1","SUSE-SU-2021:2422-1","SUSE-SU-2021:2427-1","SUSE-SU-2021:2438-1","SUSE-SU-2021:2451-1","SUSE-SU-2021:2487-1","SUSE-SU-2021:2538-1","SUSE-SU-2021:2542-1","SUSE-SU-2021:2559-1","SUSE-SU-2021:2560-1","SUSE-SU-2021:2577-1","SUSE-SU-2021:2584-1","SUSE-SU-2021:2643-1","SUSE-SU-2021:2678-1","SUSE-SU-2021:3876-1","openSUSE-SU-2021:1076-1","openSUSE-SU-2021:2409-1","openSUSE-SU-2021:2415-1","openSUSE-SU-2021:2427-1","openSUSE-SU-2021:3876-1","openSUSE-SU-2024:10728-1","openSUSE-SU-2024:13704-1"],"database_specific":{"unresolved_ranges":[{"cpe":"cpe:2.3:a:oracle:communications_session_border_controller:8.2:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.2"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:oracle:communications_session_border_controller:8.3:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.3"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:oracle:communications_session_border_controller:8.4:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"8.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:a:oracle:communications_session_border_controller:9.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"9.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"10.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"9.0"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"34"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.16"},{"fixed":"4.4.276"},{"introduced":"4.5"},{"fixed":"4.9.276"},{"introduced":"4.10"},{"fixed":"4.14.240"},{"introduced":"4.15"},{"fixed":"4.19.198"},{"introduced":"4.20"},{"fixed":"5.4.134"},{"introduced":"5.5"},{"fixed":"5.10.52"},{"introduced":"5.11"},{"fixed":"5.12.19"},{"introduced":"5.13"},{"fixed":"5.13.4"}],"source":"CPE_FIELD"},{"cpe":"cpe:2.3:o:sonicwall:sma1000_firmware:*:*:*:*:*:*:*:*","extracted_events":[{"last_affected":"12.4.2-02044"}],"source":"CPE_FIELD"}]},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/07/22/7"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/08/25/10"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/09/17/2"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/09/17/4"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2021/09/21/1"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html"},{"type":"ADVISORY","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210819-0004/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4941"},{"type":"FIX","url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4"},{"type":"FIX","url":"https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html"},{"type":"EVIDENCE","url":"https://www.openwall.com/lists/oss-security/2021/07/20/1"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/torvalds/linux","events":[{"introduced":"0"},{"fixed":"d8ec26d7f8287f5788a494f56e8814210f0e64be"}],"database_specific":{"cpe":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.12.43"},{"fixed":"3.13"}],"source":"CPE_FIELD"}}],"versions":["v3.13-rc6","v3.13-rc8","v3.12","v3.13-rc7","v3.13-rc1","v3.13-rc4","v3.13-rc3","v3.13-rc5","v3.13-rc2","v3.12-rc7","v3.12-rc3","v3.12-rc6","v3.12-rc1","v3.12-rc5","v3.11","v3.12-rc2","v3.12-rc4","v3.11-rc7","v3.11-rc2","v3.11-rc5","v3.11-rc1","v3.11-rc3","v3.11-rc4","v3.11-rc6"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