MGASA-2017-0387

Dashboard / Vulnerabilities / MGASA-2017-0387

MGASA-2017-0387

Summary: Updated kernel-linus packages fix security vulnerabilities

Details: This kernel-linus update is based on upstream 4.4.92 and fixes at least the following security issues: A security flaw was discovered in nl80211_set_rekey_data() function in the Linux kernel since v3.1-rc1 through v4.13. This function does not check whether the required attributes are present in a netlink request. This request can be issued by a user with CAP_NET_ADMIN privilege and may result in NULL dereference and a system crash (CVE-2017-12153). Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could acce s (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS (CVE-2017-12154). The tcp_disconnect function in net/ipv4/tcp.c in the Linux kernel before 4.12 allows local users to cause a denial of service (__tcp_select_window divide-by-zero error and system crash) by triggering a disconnect within a certain tcp_recvmsg code path (CVE-2017-14106). The atyfb_ioctl function in drivers/video/fbdev/aty/atyfb_base.c in the Linux kernel through 4.12.10 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory by reading locations associated with padding bytes (CVE-2017-14156). It was found that the iscsi_if_rx() function in scsi_transport_iscsi.c in the Linux kernel since v2.6.24-rc1 through 4.13.2 allows local users to cause a denial of service (a system panic) by making a number of certain syscalls by leveraging incorrect length validation in the kernel code (CVE-2017-14489). The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel before 4.13.4 allows local users to obtain sensitive information from uninitialized kernel heap-memory locations via an SG_GET_REQUEST_TABLE ioctl call for /dev/sg0 (CVE-2017-14991). A reachable assertion failure flaw was found in the Linux kernel built with KVM virtualisation(CONFIG_KVM) support with Virtual Function I/O feature (CONFIG_VFIO) enabled. This failure could occur if a malicious guest device sent a virtual interrupt (guest IRQ) with a larger (>1024) index value (CVE-2017-1000252). For other upstream fixes in this update, read the referenced changelogs.

References: https://advisories.mageia.org/MGASA-2017-0387.html, https://bugs.mageia.org/show_bug.cgi?id=21853, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.89, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.90, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.91, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.92