CVE-2021-33909

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CVE-2021-33909

Summary:

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.

References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/, http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html, http://www.openwall.com/lists/oss-security/2021/09/17/4, https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html, http://www.openwall.com/lists/oss-security/2021/07/22/7, https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html, https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015, https://www.debian.org/security/2021/dsa-4941, http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html, http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html, http://www.openwall.com/lists/oss-security/2021/08/25/10, http://www.openwall.com/lists/oss-security/2021/09/17/2, http://www.openwall.com/lists/oss-security/2021/09/21/1, https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html, https://security.netapp.com/advisory/ntap-20210819-0004/, https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4, https://www.oracle.com/security-alerts/cpujan2022.html, https://www.openwall.com/lists/oss-security/2021/07/20/1, http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html