Scientific Linux Security Update : kernel on SL7.x x86_64

This script is Copyright (C) 2017 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

Security Fix(es) :

- A flaw was found in the way Linux kernel allocates heap
memory to build the scattergather list from a fragment
list(skb_shinfo(skb)->frag_list) in the socket
buffer(skb_buff). The heap overflow occurred if

- 1' parameter and 'NETIF_F_FRAGLIST' feature were used
together. A remote user or process could use this flaw
to potentially escalate their privilege on a system.
(CVE-2017-7477, Important)

- The NFS2/3 RPC client could send long arguments to the
NFS server. These encoded arguments are stored in an
array of memory pages, and accessed using pointer
variables. Arbitrarily long arguments could make these
pointers point outside the array and cause an
out-of-bounds memory access. A remote user or program
could use this flaw to crash the kernel (denial of
service). (CVE-2017-7645, Important)

- The NFSv2 and NFSv3 server implementations in the Linux
kernel through 4.10.13 lacked certain checks for the end
of a buffer. A remote attacker could trigger a
pointer-arithmetic error or possibly cause other
unspecified impacts using crafted requests related to
fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895,

- The Linux kernel built with the Kernel-based Virtual
Machine (CONFIG_KVM) support was vulnerable to an
incorrect segment selector(SS) value error. The error
could occur while loading values into the SS register in
long mode. A user or process inside a guest could use
this flaw to crash the guest, resulting in DoS or
potentially escalate their privileges inside the guest.
(CVE-2017-2583, Moderate)

- A flaw was found in the Linux kernel's handling of
packets with the URG flag. Applications using the
splice() and tcp_splice_read() functionality could allow
a remote attacker to force the kernel to enter a
condition in which it could loop indefinitely.
(CVE-2017-6214, Moderate)

Bug Fix(es) :

- Previously, the reserved-pages counter (HugePages_Rsvd)
was bigger than the total-pages counter
(HugePages_Total) in the /proc/meminfo file, and
HugePages_Rsvd underflowed. With this update, the
HugeTLB feature of the Linux kernel has been fixed, and
HugePages_Rsvd underflow no longer occurs.

- If a directory on a NFS client was modified while being
listed, the NFS client could restart the directory
listing multiple times. Consequently, the performance of
listing the directory was sub-optimal. With this update,
the restarting of the directory listing happens less
frequently. As a result, the performance of listing the
directory while it is being modified has improved.

- The Fibre Channel over Ethernet (FCoE) adapter in some
cases failed to reboot. This update fixes the qla2xxx
driver, and FCoE adapter now reboots as expected.

- When a VM with Virtual Function I/O (VFIO) device was
rebooted, the QEMU process occasionally terminated
unexpectedly due to a failed VFIO Direct Memory Access
(DMA) map request. This update fixes the vfio driver and
QEMU no longer crashes in the described situation.

- When the operating system was booted with the in-box
lpfc driver, a kernel panic occurred on the
little-endian variant of IBM Power Systems. This update
fixes lpfc, and the kernel no longer panics in the
described situation.

- When creating or destroying a VM with Virtual Function
I/O (VFIO) devices with 'Hugepages' feature enabled,
errors in Direct Memory Access (DMA) page table entry
(PTE) mappings occurred, and QEMU memory usage behaved
unpredictably. This update fixes range computation when
making room for large pages in Input/Output Memory
Management Unit (IOMMU). As a result, errors in DMA PTE
mappings no longer occur, and QEMU has a predictable
memory usage in the described situation.

See also :

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 101105 ()

Bugtraq ID:

CVE ID: CVE-2017-2583

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