| Description: | Summary:
The remote host is missing an update for the 'kernel-linus' package(s) announced via the MGASA-2021-0152 advisory.
Vulnerability Insight:
This kernel-linus update is based on upstream 5.10.25 and fixes at least the
following security issues:
A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau
driver functionality in versions prior to 5.12-rc1 in the way the user calls
ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to
crash the system. (CVE-2020-25639).
Unprivileged BPF programs running on affected systems can bypass the
protection and execute speculatively out-of-bounds loads from any location
within the kernel memory. This can be abused to extract contents of kernel
memory via side-channel (CVE-2020-27170).
Unprivileged BPF programs running on affected 64-bit systems can exploit
this to execute speculatively out-of-bounds loads from 4GB window within
the kernel memory. This can be abused to extract contents of kernel memory
via side-channel (CVE-2020-27171).
An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer
leak can be used to determine the address of the iscsi_transport structure.
When an iSCSI transport is registered with the iSCSI subsystem, the
transport's handle is available to unprivileged users via the sysfs file
system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the
show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is
called, which leaks the handle. This handle is actually the pointer to an
iscsi_transport struct in the kernel module's global variables
(CVE-2021-27363).
An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/
scsi_transport_iscsi.c is adversely affected by the ability of an
unprivileged user to craft Netlink messages (CVE-2021-27364).
An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI
data structures do not have appropriate length constraints or checks, and
can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink
message that is associated with iSCSI, and has a length up to the maximum
length of a Netlink message (CVE-2021-27365).
An issue was discovered in the Linux kernel through 5.11.3, as used with
Xen PV. A certain part of the netback driver lacks necessary treatment of
errors such as failed memory allocations (as a result of changes to the
handling of grant mapping errors). A host OS denial of service may occur
during misbehavior of a networking frontend driver. NOTE: this issue
exists because of an incomplete fix for CVE-2021-26931.
(CVE-2021-28038 / XSA-367)
An issue was discovered in the Linux kernel 5.9.x through 5.11.3, as used
with Xen. In some less-common configurations, an x86 PV guest OS user can
crash a Dom0 or driver domain via a large amount of I/O activity. The
issue relates to misuse of guest physical addresses when a configuration
has CONFIG_XEN_UNPOPULATED_ALLOC but not CONFIG_XEN_BALLOON_MEMORY_HOTPLUG.
(CVE-2021-28039 / XSA-369)
An issue was discovered in the Linux kernel through ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'kernel-linus' package(s) on Mageia 7, Mageia 8.
Solution:
Please install the updated package(s).
CVSS Score:
7.2
CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
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