Advisories ยป MGASA-2016-0015

Updated kernel-tmb packages provides 4.1 longterm kernel and fixes security issues

Publication date: 14 Jan 2016
Type: security
Affected Mageia releases : 5
CVE: CVE-2015-1333 , CVE-2015-4176 , CVE-2015-4177 , CVE-2015-4178 , CVE-2015-4692 , CVE-2015-4700 , CVE-2015-5156 , CVE-2015-5257 , CVE-2015-5307 , CVE-2015-5697 , CVE-2015-5706 , CVE-2015-5707 , CVE-2015-6937 , CVE-2015-7312 , CVE-2015-7872 , CVE-2015-7884 , CVE-2015-7885 , CVE-2015-8104 , CVE-2015-8550 , CVE-2015-8551 , CVE-2015-8552 , CVE-2015-8660

Description

This kernel-tmb update provides an upgrade to the upstream 4.1 longterm
kernel series, currently based on 4.1.15 and resolves atleast the
following security issues:

It was found that the Linux kernel's keyring implementation would leak
memory when adding a key to a keyring via the add_key() function. A
local attacker could use this flaw to exhaust all available memory on
the system. (CVE-2015-1333)

A flaw was found in the Linux kernel where the deletion of a file or
directory could trigger an unmount and reveal data under a mount point.
This flaw was inadvertently introduced with the new feature of being able
to lazily unmount a mount tree when using file system user namespaces.
(CVE-2015-4176)

A flaw was discovered in the kernel's collect_mounts function. If the kernel
audit subsystem called collect_mounts to audit an unmounted path, it could
panic the system. With this flaw, an unprivileged user could call umount
(MNT_DETACH) to launch a denial-of-service attack. (CVE-2015-4177)

A flaw was found in the Linux kernel which is related to the user namespace
lazily unmounting file systems. The fs_pin struct has two members (m_list
and s_list) which are usually initialized on use in the pin_insert_group
function. However, these members might go unmodified; in this case, the
system panics when it attempts to destroy or free them. This flaw could be
used to launch a denial-of-service attack. (CVE-2015-4178)

A DoS flaw was found for a Linux kernel built for the x86 architecture which
had the KVM virtualization support(CONFIG_KVM) enabled. The kernel would be
vulnerable to a NULL pointer dereference flaw in Linux kernel's
kvm_apic_has_events() function while doing an ioctl. An unprivileged user
able to access the "/dev/kvm" device could use this flaw to crash the system
kernel. (CVE-2015-4692)

A flaw was found in the kernel's implementation of the Berkeley Packet
Filter (BPF). A local attacker could craft BPF code to crash the system
by creating a situation in which the JIT compiler would fail to correctly
optimize the JIT image on the last pass. This would lead to the CPU
executing instructions that were not part of the JIT code. (CVE-2015-4700)

The virtnet_probe function in drivers/net/virtio_net.c in the Linux kernel
before 4.2 attempts to support a FRAGLIST feature without proper memory
allocation, which allows guest OS users to cause a denial of service (buffer
overflow and memory corruption) via a crafted sequence of fragmented packets.
(CVE-2015-5156)

Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained
hardcoded attributes about the USB devices. An attacker could construct a
fake WhiteHEAT USB device that, when inserted, causes a denial of service
(system crash) (CVE-2015-5257).

A guest to host DoS issue was found affecting various hypervisors. In that,
a guest can DoS the host by triggering an infinite stream of "alignment
check" (#AC) exceptions. This causes the microcode to enter an infinite loop
where the core never receives another interrupt. The host kernel panics due
to this effect (CVE-2015-5307).

The get_bitmap_file function in drivers/md/md.c in the Linux kernel before
4.1.6 does not initialize a certain bitmap data structure, which allows
local users to obtain sensitive information from kernel memory via a
GET_BITMAP_FILE ioctl call. (CVE-2015-5697)

Use-after-free vulnerability in the path_openat function in fs/namei.c in
the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a
denial of service or possibly have unspecified other impact via O_TMPFILE
filesystem operations that leverage a duplicate cleanup operation.
(CVE-2015-5706)

It was discovered that an integer overflow error existed in the SCSIgeneric
(sg) driver in the Linux kernel. A local attacker with writepermission to a
SCSI generic device could use this to cause a denial of service (system
crash) or potentially escalate their privileges. (CVE-2015-5707)

The __rds_conn_create function in net/rds/connection.c in the Linux kernel
through 4.2.3 allows local users to cause a denial of service (NULL pointer
dereference and system crash) or possibly have unspecified other impact by
using a socket that was not properly bound (CVE-2015-6937).

The key_gc_unused_keys function in security/keys/gc.c in the Linux kernel
through 4.2.6 allows local users to cause a denial of service (OOPS) via
crafted keyctl commands (CVE-2015-7872).

The vivid_fb_ioctl function in drivers/media/platform/vivid/vivid-osd.c in
the Linux kernel through 4.3.3 does not initialize a certain structure
member, which allows local users to obtain sensitive information from
kernel memory via a crafted application (CVE-2015-7884).

The dgnc_mgmt_ioctl function in drivers/staging/dgnc/dgnc_mgmt.c in the
Linux kernel through 4.3.3 does not initialize a certain structure member,
which allows local users to obtain sensitive information from kernel memory
via a crafted application (CVE-2015-7885).

A guest to host DoS issue was found affecting various hypervisors. In that,
a guest can DoS the host by triggering an infinite stream of "debug check"
(#DB) exceptions. This causes the microcode to enter an infinite loop where
the core never receives another interrupt. The host kernel panics due to
this effect (CVE-2015-8104).

Felix Wilhelm discovered a race condition in the Xen paravirtualized
drivers which can cause double fetch vulnerabilities. An attacker in the
paravirtualized guest could exploit this flaw to cause a denial of service
(crash the host) or potentially execute arbitrary code on the host
(CVE-2015-8550 / XSA-155).

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device's state. An attacker could exploit
this flaw to cause a denial of service (NULL dereference) on the host
(CVE-2015-8551 / XSA-157).

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not
perform sanity checks on the device's state. An attacker could exploit
this flaw to cause a denial of service by flooding the logging system
with WARN() messages causing the initial domain to exhaust disk space
(CVE-2015-8552 / XSA-157).

The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel
through 4.3.3 attempts to merge distinct setattr operations, which allows
local users to bypass intended access restrictions and modify the
attributes of arbitrary overlay files via a crafted application
(CVE-2015-8660).

For other upstream fixes, see the referenced changelogs.

Other fixes in this update:
* improve ath10k (QCA99X0, QCA988X, QCA6174) support (mga#16915)
* silence a harmless warning on 32bit non-dt hardware (mga#17010)
* fix regression with AlpsPS/2 ALPS DualPoint TouchPad of a Dell
  Latitude D600 (mga#17034)
                

References

SRPMS

5/core