Advisories ยป MGASA-2017-0384

Updated kernel-tmb packages fix security vulnerabilities

Publication date: 24 Oct 2017
Modification date: 17 Feb 2022
Type: security
Affected Mageia releases : 6
CVE: CVE-2017-7518 , CVE-2017-7558 , CVE-2017-12153 , CVE-2017-12154 , CVE-2017-14106 , CVE-2017-14156 , CVE-2017-14489 , CVE-2017-14991 , CVE-2017-14497 , CVE-2017-1000252


This kernel-tmb update is based on upstream 4.9.56 and fixes at least the
following security issues:

A flaw was found in the way the Linux KVM module processed the trap flag(TF)
bit in EFLAGS during emulation of the syscall instruction, which leads to a
debug exception(#DB) being raised in the guest stack. A user/process inside
a guest could use this flaw to potentially escalate their privileges inside
the guest (CVE-2017-7518).

A kernel data leak due to an out-of-bound read was found in the Linux kernel
in inet_diag_msg_sctp{,l}addr_fill() and sctp_get_sctp_info() functions
present since version 4.7-rc1 through version 4.13. A data leak happens when
these functions fill in sockaddr data structures used to export socket's
diagnostic information. As a result, up to 100 bytes of the slab data could
be leaked to a userspace (CVE-2017-7558).

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

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

The tpacket_rcv() function in 'net/packet/af_packet.c' file in the Linux
kernel before 4.13 mishandles vnet headers, which might allow local users
to cause a denial of service (buffer overflow, and disk and memory
corruption) or possibly have unspecified other impact via crafted system
calls (CVE-2017-14497).

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

For other upstream fixes in this update, read the referenced changelogs.