MGASA-2021-0204

Dashboard / Vulnerabilities / MGASA-2021-0204

MGASA-2021-0204

Summary: Updated kernel packages fix security vulnerabilities

Details: This kernel update is based on upstream 5.10.33 and fixes at least the following security issues: A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket (CVE-2021-23133). An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/ verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations (CVE-2021-29155). This update also contains the following: - xtables-addons has been updated to 3.18 (only in Mageia 8) - wireguard-tools has been updated to v1.0.20210424-1.mga8 For other upstream fixes, see the referenced changelogs.

References: https://advisories.mageia.org/MGASA-2021-0204.html, https://bugs.mageia.org/show_bug.cgi?id=28856, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.31, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.32, https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.33